She is a quadriplegic, so some were not sure she would be able to hit the high notes in the theme song for the movie Alone Yet Not Alone. Watch carefully and you will see her husband Ken Tada, pushing on Joni ("Johnny") Eareckson Tada's stomach to enable her to sing.
This movie has just come out in theatres, though you might have heard about its controversy. It was nominated for an Oscar (Academy Award) in the United States, but they took away the nomination.