Would you be upset after this with your Mother in Law?

Mothers-in-law are supposed to piss you off. I live in an addition to my in-laws' house with my husband and our 4 kids. It's a daily battle for me, but if you had sent your daughter to her grandmother and this lady said she wanted to pick her up you could've refused the offer. She really should have told you when she was home. If there is a next time tell her you want to know when she gets home with your daughter. It should be your choice to let her spend time over there. Good luck and try not to slap her. Peace.