Zahra Allahyari of Poway was hiking with family members Sunday morning when she fell down the Grand Canyon of Yellowstone, the National Park Service said.
The incident occurred about two-thirds of the way down the trail to the Brink of the Lower Falls.
“Zahra reportedly stepped off the trail, lost her footing, and fell approximately 550 feet into the canyon,” park officials said in a statement.
Park personnel retrieved her body about noon Sunday.
There have been three accidental deaths this year at Yellowstone, according to officials.