Her grandparents should be concerned about her weight. Eight years old and already she looks 20 pounds overweight. They should focus on her exercise and portion size. The poor child. It’s not easy being overweight.
I agree-that isn’t mentioned, but I’m going to guess that she was being teased about her weight, and if it was mentioned by the school to the grandparents, maybe they thought it was offensive rather than well-meaning advice. Either way, someone is going to be sued, and nobody will be the better for it but lawyers.