In 1995, Mashay's manager at the time contacted Michael O'Hara to work on an initial demo for a possible recording deal. They wrote five songs together in her California home, but the songs never went anywhere. Mashay ended up writing a song called "Something to Feel" and it got picked up by Island Records. In her thirties, music labels in the '90s thought she was too old for a record deal but she never gave up.
Mashay has an extensive résumé of work as a background and session singer working, most notably, with Gladys Horton in a 1980s regrouping of The Marvelettes. Mashay's photo can be seen on the cover of the CD The Marvelettes: The Very Best of the Motor City Recordings.
As a lead vocalist, Mashay has released many tracks that have performed well on the U.S. Hot Dance Club Play chart and the Hot Dance Airplay chart. Those singles include "Something to Feel" (1995), "Happiness" (1997), "Step Into My Life" (1998), "Sextacy" (2000) and "Send Me an Angel" (2005). Her voice is probably best known from the "Let's get soaking wet!" chanting throughout the Barry Harris track "Dive in the Pool", made famous by its inclusion in the American television series Queer as Folk. Another collaboration with Harris, "I Got My Pride", hit number two on the U.S. Hot Dance Music/Club Play chart in 200