(CNN) — Mackenzie Riley is only 13 years old, but her schedule is busier than many adults. Besides being on her middle-school yearbook staff and taking piano and voice lessons once a week, she is also the co-captain of her seventh-grade basketball and volleyball teams.
“I like playing sports a lot,” Mackenzie says. “I like the teamwork and having us all come together.” This year she is also adding softball and track to the mix.
Mackenzie’s parents, Todd and JoAnna Riley, attend many of her games, so during last year’s basketball season they knew immediately when something was wrong. “We noticed that as she was playing she asked to sit down more, which is not something she typically wants to do,” recalls JoAnna Riley.
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