Confused

I work 2 days a week and my mum babysits my 11 month old son. I pre make all of his meals, bottles and snacks so all she has to do is heat them up, I have also written down his routine and I take over with him all his favorite toys and his little blanket he sleeps with. She often tells me he doesn't like the food I made him so she gives him jar food, she also says he doesn't play with the toys I bring (even though he loves those at home), and she often refuses to follow his nap schedule so he is in a grumpy mood when I come get him and she says she refuses to use his nap blanket thing cause it's silly and he doesn't like it. I'm so appreciative of her taking care of him but why does she need to be so negative with everything I do, I think I'm doing really well and my son is such a happy little guy but everytime I go see my mum she just has to knock me down and make me feel like crap. What is her problem??