Kimchi Truong, of Oakland, collapsed at Empire Polo Club last Saturday and was taken to JFK Memorial Hospital in Indio. She was later transferred to Desert Regional Medical Center, where she died on Thursday.
A statement issued by the festival's organizer, Goldenvoice, said: "We are saddened to learn the individual has died. We believe this to be an unfortunate but isolated incident. Our thoughts and condolences are with the family and friends."
City News Service contributed to this report.