That last text is her testing you. You just focus on giving space the next few days. She is going to come across this way to you a lot. She's just beginning on pushing your buttons friend. You have no idea except you heard it here on these boards first.
She's going to come at you. I don't have kids, but I've seen many posts about it. Based on how well you have done I would suggest getting a visitation schedule set up and an agreement on the kids legally. Take action for them first and let her do everything else.
If it's not kid related...DO NOT respond. I'm sure the pro's can step in on this sitch and really give you better advice. But one thing I do know, is if it isn't kid related...DO NOT respond.
LOL She's pissed man, it will show. Seriously. Hang in there.