こんなのみつけました。
Here is her entry in Kehler's "The Piano in Concert":
"BIANCA, SONDRA
American pianist, was born at Brooklyn, N.Y., on November 17, 1930.
She studied under the direction of her mother, then with Frank Sheridan
at Mannes Music School and Isabella Vengerova at Curtis Institute of Music.
Bianca was soloist with the Schenectady Symphony Orchestra and performed
over the French network of the Canadian Broadcasting Corporation prior to
her New York City debut on November 1, 1941, with the New York
Philharmonic - Sympony Orchestra at Carnegie Hall.
She also appeared with other major orchestras."