Born in Canada on a farm in 1913, she moved with her family to California when she was 10. After her first husband, Eric Charles Twist, died, she left the southern part of the state and began teaching in Northern California, meeting her second husband, Frank Edward Winnburg, at Sequoia High School, where they both taught. She also taught at Woodside High School, relatives said.
Ms. Winnburg attended Chapman University and Occidental College, then earned a master's degree from Stanford University. According to her family, she was a loyal alumnus who loved going to the football games.
She enjoyed volunteering, particularly at the Allied Arts Guild, where she donated her time for many years, and took up painting and sculpting.
The family held a private memorial service. Ms. Winnburg leaves her daughter, Margaret Twist Fry, and three grandchildren and seven great-grandchildren. Sisters Louise Turner and Marguerite Lewis preceded her in death, as did both her husbands.
Her family thanked caregivers Margaret Chinappa and Josephina Baratang, as well as the staff of Odyssey Healthcare. They request that donations in her memory be made to the Lucile Packard Stanford Children's Hospital, 400 Hamilton Ave., Palo Alto, CA 94301; or to a charity of the donor's choice.