Hi, thanks for using healthcare magic
Loss of appetite and weight loss that persists for 2 months is concerning. If it was due to a virus that is was going around then it should resolved, it is unlikely to last this length of time.
An infection involving any of the structures within the abdomen should also have either resolved or worsened to the point she would have required immediate care, for example if the pain was related to appendicitis
which would have been untreated, by now she would have required treatment in a hospital.
Chronic abdominal pain
in children can be related to peptic disorders (reflux esophagits, ulcer in the stomach or duodenum), constipation, inflammatory bowel disease
, abdominal migraine or functional abdominal pain
Her parents may want to consider taking her for a second opinion
if they are unsatisfied with the diagnosis. A careful history needs to be taken to find out the exact nature of any symptoms she is experiencing and imaging is required.
I hope this helps