What do therapists and coaches suggest? I don't think it is a good idea to not tell her who is watching the kids. I think telling her the name of the person and their credentials is appropriate. Especially since she asked.
not telling her requested information concerning kids sounds petty and punishing to me. It is not good coparentiNg. I agree that you should not go out of your way for her. But a simple response to a question regarding young children is appropriate. You do not want to come across as someone that is not working in best interests of kids. Keeping info hidden is certainly not in kids best interest. Especially when they are young and cannot communicate well for themselves.
For her to have mini van sounds like it is in best interest of kids?
Me: 42 H: 43 Twins age 5 Physically Separated 7/2015