Well,it would have been of help had mentioned, the type ,radiation
,exact site and other characteristics of pain.I would suggest a USG-Abdomen to exclude gallstones, serum amylase
and lipase levels to exclude pancreatitis
.Also,a serum Calcium level should be done to exclude Hyperparathyroidism
.By the way,does she also have bone pain/urinary symptoms,which further support the latter diagnosis.