After performing as a backing singer for many years she was eventually given her own recording contract. Shepard's first chart appearance was in 1987, when she recorded a duet with Dan Hill entitled "Can't We Try." Before this, she had tried out for the part of Michael J. Fox's sister in Light of Day, but she lost the part to Joan Jett. She was also poised to sing on Peter Cetera's duet "The Next Time I Fall," but he picked Amy Grant instead. She released her first self-titled album in 1989, but with little fanfare. The album did yield one chart single, "Don't Cry Ilene," a middle-tempo piano-driven jazz-R&B flavored song dealing with the break-up of a relationship between a black woman and a white man, arising from adult peer pressure. The track is sung from the perspective of the woman's white female friend, who harbors a Desire to have the man for herself, but keeps her distance out of respect for her friend. The song peaked at Number 17 on the Billboard Hot Adult Contemporary chart and stayed on the charts for 12 weeks.

Shepard married music Producer Mitchell Froom in 2004; they had their first child in 2006. She is also the stepmother to Froom's daughter, Ruby, from his marriage to Suzanne Vega.

Shepard provided vocals for "I Need You," whose music had been composed by James Newton Howard, for the 2010 film Love & Other Drugs, which starred Jake Gyllenhaal and Anne Hathaway.