For example she'll say something along the lines of "you didn't help enough with ___ (kids, chores, pets, dinner... .)"
Ok, I get it, she's feeling overwhelmed and tired. I usually respond with something like "Yes I know there is a lot to do around the house and you feel like it all falls on you. Between school starting up and new work schedules it has been tough for us to keep up. I should have some time this weekend to give you more help"
You're very very close. At the end, like you said, you pick up the blame/emotion for her by trying to fix it. Let her come up with the resolution. I usually go to asking her questions instead of giving the solution. So in this scenario I might say something like, "What would help you not feel so overwhelmed?" or even "How can I help you?" Depending on the situation, I might say something like "What does that feel like to you?" "What do you hope will come out of this situation?" By asking questions about the real facts/coming up with solutions, it causes my H to get out of his feelings and to either self reflect or to start being reasonable.
Her response to my validation is "You and this marriage still suck, I want out"
Ok, I reply "I understand that this is a tough time and we have a lot going on. There was so much to do it is hard for us to see what the other has been doing. I know last night we both dove in and took care of cleaning up the house as a team."
W: "I dont think you carried your weight here, and I can find a better teammate. This marriage does suck, I want out"
Round and round we go and she just ramps herself up on her feelings of how much "I and the marriage suck". There isnt even anything specific I can validate there. When I ask her to clarify what she feels sucks, or how I suck to her she just simply replies with "I don't have to explain anything to you. I don't owe you anything. I'm done!"
hmmm... .Validating that things are tough right now is good. She may still be too emotional in that moment to process the incongruity of "this marriage sucks" and "we worked as a team last night."
It sounds like she is holding onto something but isn't wanting to say what it is that she's really upset about. Or maybe say something like, "Things are tough right now. I wish it was better too. It's important to me that I understand what you're feeling. I'm having a hard time understanding what you are trying to tell me. Could you be more specific?" If she still refuses to share then it might be time to use SET to explain to her that she can't expect you to understand or make changes if she doesn't share specifics.