ExhaustedMama,
Thank you for the follow-up answer and explaining that your D is not critical with her ED, as she can eat a whole pizza. That makes me feel a whole lot better.

Because your D is 24, and she is threatening to go NC [no contact], be concerned about that. I know you have her best interest at heart, and that is very commendable.
In her posting did she mention how much she weighed? If so, you can compute her BMI [body mass index] knowing her height. What is her goal weight, do the same calculation [Google search for 'BMI Calculator']. If her current or eventual target BMI is 16 or less, be very concerned, my D's was 12.00 [upper end of the lethal range for girls from a technical paper on the crises in Ethiopia a few decades earlier] when I brought her to the hospital after I had returned from sea, 8 days later, she was in hospital recovering against her will - she was also 12 years old at the time, so she had little choice in the matter. In three months time I was gone she went from being 4% normal (9% healthy weight) to being very unhealthy of -15% of being severely underweight [thinness] with the loss of 20 pounds in the same time frame. In hospital she put on 35 pounds in a similar time frame to be at the 50% weight for her age and height.
This is the World Health Organization's (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, age 20 or older.
Category BMI range - kg/m2
Severe Thinness < 16
Moderate Thinness 16 - 17
Mild Thinness 17 - 18.5
Normal 18.5 - 25
Overweight 25 - 30
Obese Class I 30 - 35
Obese Class II 35 - 40
Obese Class III > 40
I must apologize for such a triggered response from me, as it hit way too close to home for me, with my own daughter. I did observe my D's eating habit, and it was close to 700-800 calories per day just before she went into hospital, and when you only mentioned eating applesauce, it triggered me - I did not know about the Pizza.
I appreciate both responses I received to this post. I chose to ask my daughter about my concerns without saying that I've seen her Reddit posts. Frankly, there is enough behaviour to reference to challenge her without the posts. I asked her to see her doctor with me and explained what I'm seeing and hearing that has me concerned. I suggested blood work and a medication review may be necessary. However, I got the usual deflections - I'm crazy, I'm delusional, I'm invasive, etc. I was told there's nothing I can do about it and if I keep at it she'll "cut me off".I am glad that you did that. If I were in your shoes, I would NOT let her know about your knowledge of her Reddit posts, however, do continue to monitor them, in order to gain insight to your daughter's wellbeing and health.
I looked up eating disorder groups and there are waitlists 18-24 months long! It's absolutely frustrating. At this point, she won't admit there's a problem, so even a waitlist isn't an option. I understand, that it is not an option now; however, I do suggest signing her up, so in 18-24 months, when she is ready to deal with it, it could be substantially less of a waiting list. You could always ask to be removed from the list if it is no longer an issue.
I am sorry if I triggered an alarm response when I said she is underweight. She is, and she plans to lose more; however, she is not yet emaciated and she does (though inconsistently) eat some meals, for example when I take her to a restaurant or order take out. She told me to "calm the f*** down" because she ate "an entire pizza" the other day with her friend. I'm very concerned but truly don't think there's much I can do at this point aside from continuing the dance of loving her, setting boundaries, and being here to support her when she's ready. And continuing to research treatment options. Yes, you did 'trigger' me, and I will apologize for it again as I don't want to see anyone's daughter go through that. I will share some of my coping strategies, as my daughter is a very determined young lady (now 16 yo), and it is still an issue, even though she is considered 'recovered' and has been out of treatment since she was 14 yo.
Since I imprisoned my D, it wasn't until I confronted my wife, this past fall with her uBPD did my daughter gain my respect from me from a psychological point of view. My daughter understands the need to maintain weight; however, she wants to eat healthy, and also has issues maintaining it because of that since our culture is obsessed with being thin, especially for that age group. She also knows that her parents and my uBPDw have a very toxic relationship, and my wife can rage at any one of us, and that is triggering for all of us who are on the receiving end of that.
Here are some of the methods that I and my family have used to cope with our D's ED.
Since we don't use a scale, she doesn't know how much she weighs.
+Whenever I hug her hello/goodbye, I make sure my hand feels the condition of her rib cage on her back on top of her shirt/blouse, this gives me a pretty good indication if there is enough weight on her. If it is skin covering bone, no softness, it is too light/underweight. You want to feel some give between her skin and the bone of her ribcage, that is better. Ideal is a smooth feeling, where you cannot feel the ribs at all if lightly touched.
+My D has a sweet tooth, figure out what high calorie food she loves the most, and give it to her in abundance [like the pizza you mentioned] and do it frequently, that is what her grandmother does. My D loves pie, so she gets thousands of calories of pie three times per week from her grandmother, and she can't say no to her - yes, this is manipulative, but it is for her own good, and my D has grown to enjoy these treats over the years. Granted these are dirty calories, but calories none the less. Underweight people can afford to eat this. NOTE: During her formal treatment for AN, it was advised that the whole family eat the excessive calorie load as the person with AN together at the table, I am on the other end of the ED scale with obesity, so if you are overweight and trying to lose weight, it won't help, I usually grab a piece, eat it slowly, and when she is done I stop eating it [portion control].
+If there are two ED's one Class II obese [me], Class I obese [uBPDw], and AN [D16] - I use a 'dirty keto' diet, that is high in fats and low in carbs. We also had a high carb starchy side to this for her, my wife eats it too, so I lose weight, she gains weight, and we are one big happy family, at least food wise.
+I know your D has a comorbidity of BPD and other issues, you need to manage those too.
+We also avoid TV shows/movies/magazines with skinny people. I know you can't control that; however, if you see anything like that while visiting [women's magazines], ask to borrow it to get it out of her presence.
Sometimes she will take time to process what I have said and return to it with me; I know I will address it again. This reminds me a lot of the 'seed planting tool' mentioned in the “Stop Caretaking the Borderline Or Narcissist: How to End the Drama and Get on with Life” by Margalis Fjelstad - if you haven't read this book, I highly recommend it.
When you do address it again, use the SET method of communication, to be non-confrontational as practical
https://bpdfamily.com/message_board/index.php?topic=143695.0Much appreciation for your input. You are welcome.
Be sure to take care of yourself too with your own individual therapy [to deal with this], and do exercise, curl up with a movie, or whatever makes you feel good.
Take care, and good luck.