Mondale died Monday afternoon with her husband and sons by her side. Her family said Sunday that she was in hospice care, but didn't disclose her illness.
Her passion for the arts earned her the nickname 'Joan of Art." Her husband, then-Democratic U.S. Sen. Walter Mondale, was elected Jimmy Carter's vice president in 1976.
Carter named Mondale honorary chairwoman of the Federal Council on the Arts and Humanities. She lobbied Congress and states for more spending on public arts programs.
The Associated Press contributed to this report.