gallbladder pain in the left upper quadrant?

My daughter, age 18, has had periodic LUQ pain that is sharp, stinging, and literally "takes her breath away" (her words).  She has no appendix and is otherwise very healthy.  Sometimes it seems to be related to fatty foods, sometimes not.  It most recently work her up from a deep sleep.  She points to her LUQ and the midline directly under her breasts.  

Am wondering, if this could be gallstones.  I know GB problems are usually RUQ related in symptomatology, but also know of family and friends who have had pain in other locations, i.e., lower abdomen, back, and shoulders, that was caused by gallstones.

Just looking for some input.  She has an ultrasound scheduled of the abdomen, but wanted to put the question out there.