Did they check her liver and pancratic enzyme level during or immediately after an attack - and I do mean immediate after - not 2 days later. It's unfortunately not unusual to have problems after GB surgery, and that doesn't mean only in the weeks or months afterward. It can happen years later.
If it is her pancreas, she should be following the instructions for pancreatic problems, which would be a change of diet and also taking pancreatic enzymes if necessary. You can find recommended diet changes at www.gicare.com.
But if the pancreas problems are being caused by spasms of the common bile duct or problems with the pancreatic duct, that should be handled more aggressively. A doc would have to do an ERCP with manometry to check the pressures in the different ducts and to make sure she's not harboring any small stones or sludge particles that could continue to cause problems.