Poobie,
Thank you for sharing your story. You are not alone. It sounds like your wife is doing all of the right things, self-aware, and is doing intensive therapy to address these issues.
I have never recommended this before; however, based on what you have said, and if you really love her, and are willing to do work on yourself as well, consider moving back in -- but do it with a firm game plan in mind, and perhaps, ease into it with a PHP [partial hospitalization protocol] type mentality, you move in for a few hours per day for a few weeks, then move to the whole day also for several weeks, but go back to your mom's at night, to see how the reconnection goes, and if it is not to your liking you will leave, let her know this, so she will be on best behavior.
Before you move back in you need to set firm boundaries on her behaviors. Let her set boundaries on yours too [to me they are tokens so she feels empowered, as the caretaker usually doesn't cross boundaries, unless they are reactive in nature]. If you are not in your own individual therapy, get your own therapy too, as you need to process this before you do it.
Boundary example: If she rages at you, you will immediately move out back with your mother. She needs to know ahead of time of the consequences and you must be willing to follow through on them without fail. Give them an inch, and it will take at least two weeks to restore.
Please verify the type of therapy she is in, while CBT will work, DBT is considered to be better, and ideally use a combination of both. You may want to get the same book, and see what she is doing.
There are many books on the topic; however, my favorite one [it is also the most stern one too] is “Stop Caretaking the Borderline Or Narcissist: How to End the Drama and Get on with Life” by Margalis Fjelstad
Getting back together will not be easy, there will be setbacks.
You also need to be able to do the DBT skill of 'radical acceptance'. Suggested reading while waiting for the aforementioned book is 1.06 [and most of the other topics too] at
https://bpdfamily.com/message_board/index.php?topic=329744.0.
My version of radical acceptance is to pre-forgive, in essence, I know the reality of my situation is that my wife will eventually transgress against me in the form of gas lighting or other emotional abuse when she is splitting me black. Since I know this to be a fact [based on historical patterns], I know this is going to happen again, as long as I know that she is not deliberately doing this, and I see that she is being triggered by external forces; therefore, I have already forgiven her for what she does not know that she is about to do. That's what makes it radical.
Part of radical acceptance is "Once individuals can accept reality [and forgive] while simultaneously not approving of it is when change can be made" and I have added forgiving her in the accepted part of reality, even though I do not approve of her actions and will state as much when it is happening to me.
In essence I have mentally compartmentalized my wife's bad behavior as being attributable to her mental state of mind, and she is 'not guilty by reason of insanity' literally, and that is how I treat it when she splits me black.
I am not going to sugar coat it, if and when you get back together with your wife, it is going to be tough, it is going to take continuous work, there will be setbacks, when both are willing to work at it with DBT skills, BPD can be put in to remission 98% of the time with a supportive spouse, that drops to about 60% if you aren't in the picture.
Please don't jump back in immediately. However, do your homework [I am over a thousand hours and have lost count] and learn what you are going to be doing, it is at least a full-time effort 24/7, read the 'caretaking' book at a bare minimum, and then proceed with

.
Drill down on my 'SaltyDawg' and look at my previous posts about my story. I am a 'codependent' and can't bring myself to leave.
Have any questions, please feel free to ask.
I will wrap this up, with my number one piece of advice, and that is to do 'self-care' - make sure it includes individual therapy, exercise outdoors [as simple as a walk], among other activities that you enjoy doing to recharge your spirit.
Hope and pray for the best, but also plan for the worst.
Take care, and good luck.