Thank you for your query on Healthcare Magic.
Pain in belly button area could be due to ulcer in acid peptic disease
, pancreatic problem, or intestinal problem.
It is better to investigate her as she is having the problem since 4 moths.
Investigations like ultrasound
abdomen and pelvis, CT Scan abdomen and pelvis, complete urine examination, serum pancreatic enzymes, and an upper GI endoscopy
may be required to know the cause.
I suggest you to consult a gastroenterologist
for further examination and investigations.
Hope I have answered your query.