Your wife feels entitled and wants you to be available for her at any time and whenever she needs something. She is very selfish and she is using your s10 to get to you. My advice document everything. If you can, print off the emails and text messages so that you have written proof of her behavior.
The one thing that stands out to me is that she wants s10 all to herself and doesn't want to share his time and attention w/the others and w/you. Yes, people in crisis do this...they select one child and that's it to care about.
I suspect that she's still angry and resentful that her life hasn't been a bed of roses and she has a mix of replay in the mix. However, if she is in full blown replay, she would be doing a whole lot of stuff to satisfy her urge for happiness.
If she posts again, just say "I am sorry you feel that way". She is pushing you to fight w/her in order to justify what she's doing. I would suggest that you stop making excuses for her when she fxcks up. It's her circus to deal w/and definitely her monkeys. Keep your side of the street clean and do the best you can when you have the children. I wouldn't share too much w/them, but if they ask questions, answer them as best you can.
I am so sorry she's monstering, but some of them are this way.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
