Sorry to hear about your daughter. I'm 25 myself, however, I had my appendix removed a few years back. I almost can understand what she is going through. She should be checked for scar tissue. Sometimes it can form strong bands that pulls on the walls of the abdomen, stomach, intestines, and so on. However, they can be removed, but new scar tissue will always form. I would also, ask for a CT scan. If there is definitely something going on that will pinpoint it! Another complete blood count wouldn't hurt either to make sure there isn't any infections.
Lots of well wishes!