I'm really upset

So my boyfriends mom and his sister, she watches my daughter while I'm at work. She has her 10 hours a day 5 days a week. They ran into my sister at the store and they were telling her that I leave moldy jars of food in my diaper bag and how when we have to do food diaries for my daughter (she's 11 months old and under weight) that I never write anything down. First of all neither of those things are true. Everytime I leave food in the diaper bag I tell them when I drop her off and I assume that she takes it out, you can't expect me to remember that there was food in the bag when I pick her up after working 9 hours in retail. Second of all everytime we do a food diary which has been 3 times, I write everything down when I'm not at work so I have no idea where that came from. I'm upset because I never talk bad about her even though she broke our original agreement and even though I bend for them when it comes to my daughter but they are making me out to be a bad mom.plus I'm 4 months pregnant now, I'm doing the best I can!