My ankle has been hurting for 7 weeks we knew it was sprained but then a few days ago my little sister fell on it and it hurt just to stand ?

Ankle sprain: Recommended you go back to your doctor to get reevaluated and possible further studies.

Re-Injury: It is possible that the new falling/traumatic incident could have re-sprained the ankle. Have it re-revaluated and this time you might need to consider physical therapy due to the recurrent injury. Remember, each recurrent ankle sprain will occur more often since the ankle has already been injured at least once.