If I were you I would cut off contact with her. If I called I would only ask to speak to the kid's. Then hang up when your done. I wouldn't do any special favors for her. She can't play you if you don't allow it. I guess kind of going dark.
She has a lot of nerve to be acting this way. She seems to play you a lot. I am sorry she is being so hurtful and disrespectful. I wonder how she would like it if you took the girl's to a female's house.