Vigard sang the lead vocals for Illeana Douglas for the 1996 film Grace of My Heart,[2][3] including "God Give Me Strength", which was nominated for Best Original Song at the 1st Golden Satellite Awards.

[7] She was one of the first clients to be signed to the children's division of the Ford Modeling Agency, along with Brooke Shields and Ricky Schroder.

[7] Vigard's debut stage role was in 1970 when she worked with La MaMa Experimental Theatre Club,[8] appearing in A Cheap Trick,[5][9] playing a carrot in a production starring Holly Woodlawn, Candy Darling and Jackie Curtis.

[5] Vigard continued performing in theatre, appearing in additional productions with Joanne Woodward and Shirley Knight.

[12] In 1977, Vigard played "Crissy" in the short-lived Broadway revival of Hair: The American Tribal Love-Rock Musical.

The New York Times wrote, "The very best song of all, and perhaps the best performance as well, is Miss Vigard in the stony and touching saga of a teenybopper, 'Frank Mills.'

Miss Vigard looks like an ancient 12-year-old; she sings in a clear, clean style that cuts most satisfyingly through the general lushness.

Vigard made her television debut alongside Henry Fonda in the 1978 TV movie Home to Stay.

[18] In 1983, she appeared in her first major screen role alongside Robin Williams, playing Walter Matthau's daughter in The Survivors.

Vigard was a founding member,[28] along with Michael C. Ruppert, drummer Andy Kravitz, and guitarist Doug Lewis.