It is hard to see family members feeling anxiety [and depression], to the point when it manifests into physical problems like not wanting to eat and having a sore stomach. Has she been able to convey what is making her feel that way?
I'm glad to hear that you have the option of the school Psychologist and she will be seeing them. They should be able to help with you with coping mechanisms for you at home.
Just mainly wanted to respond and say you're not alone, hopefully someone with some more experience in this area pops on.