hun, you haven't done anything wrong, you haven't stuffed anything up. It sounds like she is getting overfed by the IL's.

I always have the motto, "food is for fun, until they are 1".. don't stress if she won't eat for you, the reality is she is probably just not hungry.

Perhaps you could ask your IL not to feed her any food while in their care, really at this young age, just once per day would be more than enough as she is only just learning what food is and how to eat, and that once per day could be when you can feed her

I would highly recommend BLS as other have suggested too