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In 2018, McDonough's book Christmas on Honeysuckle Lane was adapted into the Hallmark Channel film of the same name starring Alicia Witt and Colin Ferguson. McDonough appeared in the film in a minor supporting role.

In the 2000s, she returned to television acting, guest-starring on Boston Legal and The New Adventures of Old Christine (2006–2009). McDonough was a radio guest and has been on international and syndicated shows such as Get Focused Radio with Kate Hennessy. She can be seen on the internet in the show McDougall M.D. as part of the broadcasts on the TBN network.

In the 1990s, McDonough appeared as Erin Walton in a further three Waltons films: A Walton Thanksgiving Reunion (1993), A Walton Wedding (1995), and A Walton Easter (1997).

McDonough began her career as a child actor, portraying Erin Walton in the series The Waltons beginning in 1972, a role which she would portray until the series' finale in 1981. She made her feature film debut with a minor part in the action film Lovely But Deadly (1981) before co-starring with Melissa Sue Anderson in the television horror film Midnight Offerings (1981). McDonough was subsequently cast in a lead role in the slasher film Mortuary (1983), opposite Lynda Day George and Bill Paxton. She later reprised her role of Erin Walton in the Waltons television reunion films A Wedding on Walton's Mountain, Mother's Day on Walton's Mountain, and A Day for Thanks on Walton's Mountain (all released in 1982). In 1987, she had a lead role in the dark comedy Funland, about an unhinged amusement park operator.

Mary Elizabeth McDonough (born May 4, 1961), sometimes credited as Mary Beth McDonough, is an American actress and writer, best known for her role as Erin Walton on The Waltons from 1972 to 1981.

Mary Elizabeth McDonough was born May 4, 1961 in the Van Nuys section of Los Angeles, California, the third of four children to Lawrence and Elizabeth (née Murray) McDonough. Her father was an Irish American ex-marine from Nebraska, while her mother was from La Junta, Colorado. McDonough was raised Catholic, in what she described as a working-class family. She and her siblings were raised in Northridge, and attended Our Lady of Lourdes School in Los Angeles. McDonough was an active theater student, and became interested in acting in elementary school.