Your daughter should continue her present level of activity and eat a well balanced healthy diet while her doctor determines the reason for the gall stones and whether they need to be removed. There is no single answer to your question until the reason for the stones is determined. It may be necessary to have her gall bladder removed if he stones cannot be addressed medically. Please consult her doctor with this concern. Meanwhile, do encourage fluid intake as you are now. Treatment for asymptomatic gallstones in the absence of sickle cell disease can include monitoring and possibly use of Ursodeoxycholic acid therapy. Symptomatic gallstones usually have to be surgically managed.