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You are seeing a 15-year old girl with pain in her right foot. She is moderately overweight, and joined a running club 1 month ago to improve her fitness and lose weight. Over the past 1 ½ weeks she has slowly developed pain in the area of her 3rd metatarsal shaft. At first she only had it after running, but now she has it more often. Ibuprofen does reduce the pain, but it returns. She has had no fever, fatigue, or other symptoms, and has lost 5 pounds. (She is also modifying her diet.) She has been having normal menses and did not have any specific traumatic injury. On exam, she is tender over the area of pain but there is no swelling. Radiographs of the foot are read as normal.

What is the best next step?