Erendira Vazquez Wallenda's stunt happened Thursday morning.
Wallenda was tethered by her waist to comply with a New York state law that requires safety harnesses for performers more than 20 feet in the air. She was on a Hula-Hoop-type device dangling from a helicopter as it flew 300 feet above the Falls.
Her husband, tightrope walker Nik Wallenda, said the cable wouldn't aide her performance.
Thursday's stunt was attempted on the fifth anniversary of Nik Wallenda's televised tightrope walk from the American side of the Falls to the Canadian side.
SEE ALSO: No harness, not net, no vision, no problem for Nik Wallenda
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