Boyfriends Mother pushing too much?

Jordan
So the other day my boyfriends mother and I were talking about the family reunion trip I have with my family coming up in June. It's in Portland, OR and my immediate family and I live in South Carolina (military family when I was younger). Anyways, she said she will be taking our son to church once he gets here and wants me to leave him in South Carolina with her while I'm in Oregon for two-three weeks. The second one isn't going to happen but I told her that I'd think about taking him to church. In all honesty, I really do not want him going with her. One- I do not trust her driving, Two- I don't like the church she goes to, Three- She didn't ask, she just told me, and Four- I just don't feel comfortable with the idea. Am I overreacting?