My 11 Year Old Daughter Started Complaining Her Right Arm,

My 11 year old daughter started complaining her right arm, wrist and shoulder hurt. There are days she cant hold a pencil or even lift her blanket. You can't touch it, because its sensitive to the touch. We took her to the E.R they didnt find anything. Her regular dr sent her to a neurologist, they didnt find anything. Its going on 3 months now. I need answers. She shouldn't have to live in pain.