The Girl Who Could Fly by C. S. Forester

Piper McCloud, a spirited girl raised on a quiet farm, harbors a startling secret—she can fly. When government agents take her to a secluded facility for children with unusual talents, she must make friends, outwit her captors, and lead a daring escape. In the process she learns to embrace her gift, stand up for herself, and fight for the people she loves.