I am the WA in my sitch and I agree that you need to confirm there isn't an EA/PA so you can make sure you are going forward with all the information. But I also want to add that if you were begging/pleading/etc. then this can also push her out the door. It's like being cornered. She asked for some time and you pushed...when you feel cornered one of 2 things happens fight/flight. She fought your for 20 days now she's ready to run.
It was fast, but I don't know her or the entire story but I do get the progression she went through.
Don't give up, Doodi
"I feel like Rocky in the fifteenth round, beaten beyond recognition, when I realize, the only person I've been fighting for is...myself."