Diarrhea!

my friend has diarrhea every morning. I feel so bad for her, when we have sleepovers shes always running in the bathroom. she's not lactose or allergic to any foods.. and she wants this to be cured by the time we go back to school, in two weeks. what...

should she do?
thanks-

ok.there might be a problem with the stomach.she needs 2 go 2 the doctor.they can tell her wats wrong.I dont want to scare her but my grandma had 2 have surgery cause of that.

consult a doctor

Okay well she should try eating more solid food. if you put solids into your body solids come out! but this would only be the case if she werent eating and just drinking water and stuff...
so if she is already eating then I would deffinately just talk to a doctor..its easy.