I'm remembering all the amazing advice I've received in just this thread alone about how to respond to her. Just text "What is it?" and leave it to her to explain herself. Don't make a big deal about it. Don't be surprised or outraged or otherwise moved by anything she says or does. Everyone here has said it again and again she's just wants to regain control and in her mind make me the bad bitter one b/c I won't play happy family with my wayward W. Just accept it and keep moving.
You've got it!