Pls be careful before asking especially if she is taking care of your child. I think it's difficult to change her when she have pre-conceived bias. You'd better prepare for the worst if you decide to talk to her about this. Otherwise, you dont know what she would do when all of you is not at home...
Gigeebee, if you want to fire, make sure you get her leave your home immediate at the same date you notify her and keep an close eye on her...so as to avoid unnecessary dispute....