My Daughter Has Been Diagnosted With Multiple Gallstones.She Has Had

My daughter has been diagnosted with multiple gallstones.She has had diariah after eating for about a month now and she has lost 23 lbs...She drinks but hasn't been eating much of anything..She did a lot of shopping yesterday and today her ankles and calves are very swollen,and have bruising on them..The Dr said that she was getting dehydrated lsst week ,and now the swelling is scaring me..Could it be infection?