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She played the role of Shirley in Sandy Wilson's 1985 Canadian film My American Cousin. She went on to become part of the Vancouver-based pop group West End Girls from 1991 to 1993. Following her departure from the band in 1993, Henderson became a backing vocalist for Sarah McLachlan, and also appeared as a vocalist on albums by Delerium. She can be seen performing live on McLachlan's Mirrorball DVD.
She is the daughter of Bill Henderson, a singer-songwriter and music producer associated with the bands Chilliwack and UHF, and is a vocal instructor in Vancouver. Her older sister Saffron Henderson is also a singer and well-known voice actress.