XYZ is here, but I won't be staying...

[XYZ]

W seems to have gotten into this habit: She'll text me something benign, maybe about the kids or something. Sometimes, if convenient, I reply. And then she starts to spew venom. I did this, I did that, blah blah blah. I let those sit and ignore them.

This is new behavior on her part since I made it clear that I'm done, but I don't know what to make of it. She's clearly testing, but to what end? She has made it clear on plenty of occasions that she is done, and now I have too. Why try so hard to pick a fight? I don't know why she'd do this. Even though I don't reply, it's still pretty upsetting to see and I don't like it.

Can't decide if I should just continue to ignore them or tell her that she may text me about the kids and any business related item and to not contact me about anything else. Just not sure. I also don't want to close the door for her to come back -- if she opens it, not me.