she is very young for developing gallstones, however it is not impossible, particularly if she is overweight
. The easiest and fastest way to check for gallstones is with an abdominal ultrasound
. However keep in mind that other illnesses can cause right sided pain. If the pain is severe you should take her back to the ER for further evaluation. They might end up doing a CT scan
instead to look at the entire abdomen.
If the pain gets worse with food intake or fatty meals, then that is consistent with gallstone related pain.
Hope that helps.