I don't know, it just doesn't sound like she's respecting your choices... that would worry me immensely, and no, I don't think I'd leave my kid with her again...
Also I wonder if your DD's reaction has anything to do with being sick (or with eating cheese)??? Obviously I have no clue on the timing so that might not be it at all. But as much as I'd hate for someone to leave my DS crying like that, at the same time I don't think ONE incident with someone who's not a regular babysitter would affect her that much once she's back 'safe' with you, you know? I suppose it's possible but I'd look to other causes first.
It breaks my heart when I hear something like this, because I know you, as the mom, know what your DD needs and clearly her needs were not met while she was with MIL.













