Hello, Thanks for your query. Pain in the feet in a young is mostly due to a muscle strain or positional anomaly or flat feet. A direct examination will help in proper diagnosis. To help decrease her symptoms, she can start taking tylenol double strength twice daily after meals. Improvising body posture and doing light exercises like aerobics will help in maintaining the muscle tone. Pay careful attention to selecting the correct running shoe based upon the foot type (flexible pronator vs. rigid supinator). This is extremely important. In selected cases, shoe inserts (orthotics) may be necessary. The shoe inserts often permit patients to continue their routine activities.She may need few physiotherapy sessions along with prescription anti inflammatory drugs after getting herself examined from an Orthopedician. I do hope that you have found something helpful and I will be glad to answer any further query. Take care