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Such a problem may be seen with a Gastric ulcer. Does she have heartburn as well. You will need to get an endoscopy to confirm. Also IBD can present with pain after eating and the pain is relieved after passing stools. You will need to get a colonoscopy
to confirm with a biopsy. Lactose intolerance
is also seen in many people who have IBD (Inflammatory Bowel Disease
). She could try taking Acetaminophen/Paracetamol
for pain relief in such a case. Kindly consult a Surgeon in this regard to discuss the possible diagnosis and management.