My in-laws are in town. My mother-in-law is a loving, caring person who just wants to help. We inadvertently bump heads about 99% of the time. If I'd choose A, she loves B, and that's just the way it is.

The question is this: my mother-in-law loves children and wants them to love her. She's extremely indulgent (fine for a grandma who sees grandkids rarely) and acts like a kid herself when she's with them. While not my temperament at all, this can be a very good thing. Sometimes, though, this tips over into what I consider dangerous behavior. I stepped into the grocery store for a moment with my baby while mother-in-law and my daughter waited in the car. I came back to find my three year old daughter in the driver's seat "driving," with the keys in the ignition. Aaaah! How do I handle this? She never says no, even when she really needs to. But my daughter loves her to death. Mother-in-law always wants to watch the kids alone while I go out. I don't want to hurt her feelings or deprive her of special time with her grandkids, but I just don't feel safe. I can't think of ground rules to set because things like "driving " the car, putting the kids on the counter next to a pot of boiling grease, etc., are things I don't even think of happening. I'm grateful that my children have all their grandparents and want them to have good relationships with them. I don't want to be the over-protective and evil daughter in law. Any advice? Am I over-reacting?