Your daughter should undergo Upper GI endoscopy
along with colonoscopy
to rule out gastro intestinal cancer.
She should also do CT scan of whole abdomen.
Aldo do stool for occult blood.
T.Reglan 10 mg thrice daily before food for nausea.
Syr mucaine gel 2 tsf before food for stomach fullness.
T.Pause 500 mg thrice daily after food for blood in stool
T.Imodium 2 mg 2 hrly for diarrhea
T.Paracod twice daily for stomach pain.
Regards and take care.