My granddaughter has really worried me. Getting her to eat anything at all is a chore. She has always liked green beans, period. She will tolerate carrots. She likes dry cheerios, hates peanut butter and anything sweet. Lately she has begun to eat a little bit of chicken & stars soup, if she can help “make it”. She’s 3.
Put the veggies in a bowl, keep them warm of course, and tell her they’re Green Treats and she may NOT HAVE EVEN A TASTE until she’s eaten her other food.
Is she malnourished and/or seriously under size or weight? If she is not then I suspect your worring is misplaced - particularly if the youngster is living with her parents rather than you. It is their job to worry about such things. Your job is to enjoy your grandkids completely and to conspire with them to ensure the mothers’ curse is properly fulfilled (I hope you grow up and have kids that are just like you!).