Well, without a clinical evaluation it would be difficult to determine the cause of her pain. Likely possibilities that may need to be considered include gastritis, genito-urinary infections, GI infections/ inflammations, pancreatitis, spinal or neuro-muscular issues etc. You could try some OTC antacids and see if these tend to make a difference to the pain. If this does not help and there is no history of gastritis nor pain around the lower border of the chest bone, OTC tylenol/ NSAIDS may be tried (needless to say if any of these is present, tylenol/ NSAIDS are better avoided). In either case it is best advised to see a primary care physician to rule out the mentioned possibilities and for appropriate management.
Hope this helps.