Help is my grandmotheroverstepping ?

So I’m a single mom so my grandmother watches my daughter while I’m at work. I need to know if I have the right to feel so betrayed by this or not. My little girl is 1 year and 5 months. She is a picky eater I am as well I try to give her a variety of things she just don’t want them she would much rather just snack all day my grandmother is giving her vitamins (without me knowing) I picked her up and was getting a drink out of her fridge and saw that she had the premade Emfamil Nero pro in the fridge so she has also been giving that to her ( without telling me) she tells me all the time she’s not eating enough but I feel like she eats enough her weight gain is perfectly fine she’s perfectly healthy she’s just picky and my grandmother doesn’t like that.