This actress played on The Waltons several times, playing the role of Patsy Brimmer. She had the same last name as a regular cast member on the show, Mary Beth McDonough who played the character of Erin Walton. However, it does not appear that the two actresses are related.
At the time of her death, she was predeceased by her father, mother, and sister, and survived by a daughter, two brothers, and a sister.