"I respect this man so much more", she said of her husband after landing.
Footage shows the acrobat hooking her feet over the circle before hanging upside down with her arms stretched toward the water.
Erendira broke a record her husband set in 2011 by hanging from his teeth 250 feet in the air.
A last name synonymous with high-flying stunts pulls off another one at Niagara Falls.
Erendira Wallenda could be seen gracefully performing acrobatic moves - not out of the ordinary for a daredevil who's part of the famous Wallenda family.
Erendira Wallenda said her training in the rain and mist of Florida, where they live, helped prepare her for the conditions expected on Thursday.
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Taking off over the Horeshoe Falls at 8:35 a.m., Erendira Wallenda hung from the helicopter by clinging on to a customized mouthpiece attached to the bottom of the aircraft for 20 minutes.
Check out Nik's Wallendina's stunt on YouTube.
"Obviously, my dentist doesn't want me to do this for the rest of my life", she said.
In 2013, her husband Nik became the first man to cross the Grand Canyon on a tightrope, completing that record-breaking feat in under 23 minutes.
The signature stunt of the Flying Wallendas, as their troupe came to be known in the 1940s, was the seven-person chair pyramid - an act that went fatally wrong in 1962.
"This is my passion, this is my life", Erendira said. "Here is the new world record holder, my handsome wife, Erendira Wallenda".
You can park in lot #2, closest to the Top of the Falls restaurant. "That's unbelievable. That's awesome, '" he said.