What would you do?

I need to vent, I can't get over this.

Ive gone back to work part time and had to hire a sitter to watch my daughter between the times that I start work and hubby goes to pick her up. Well tonight the sitter texted me saying "oh I hope it's okay but my son fed your daughter crackers and cookies".. well no actually it's not okay?? She's only 6 months old? Then when hubby went to pick her up, she was sitting in some car toy and was visibly upset and crying while this lady was getting ready for a night out. Hubby told me when I got home that the sitter had not fed her her bottle or changed her diaper in the three hours she was there (I changed her before leaving but she was due for a bottle when she got to the sitters which I informed her of). Also because all she had to eat was cookies and crackers she had a very upset tummy and refused her bottle when hubby tried putting her to bed so she screamed and cried for 2 hours before I got home. I'm so angry and I feel so guilty for leaving her, I don't think I could trust anyone else watching my babygirl anymore. I feel like a terrible mother for letting someone do this.