According to the Hollywood Reporter, the actress passed away in Los Angeles.
The actress's father, dancer Ernest Belcher, was a friend of the cartoonist Walt Disney.
His animation team, while working on the cartoon, studied how the young actress moves to make Snow White's movements more realistic.
The actress began performing in front of cartoonists at the age of 14 and continued to work with them for two years.
She also modeled for the 1940 Pinocchio Blue Fairy and other cartoon characters.
Champion starred in the films Swimmer (1968), Locust Day (1975), Whose Life Is This Anyway?
(1981) and several others.