[3] Haynes participated in local singing competitions, often competing against her childhood friend and future group member Angel Taylor.

[3] After hearing Haynes perform at his church Greater St. Stephen FGBC, Grant added her to his forthcoming group along with Angel Taylor and local singer Terri Brown.

[6] The album sold over seven hundred-thousand copies in the United States, becoming certified gold by the Recording Industry Association of America (RIAA).

Trin-i-tee 5:7 has sold more than 2.5 million records worldwide to date,[9][10] and is recognized as one of the most successful contemporary gospel acts of their era.

[12] In July 2015, Haynes made her acting debut in Zach Theatre's musical revue Sophisticated Ladies.

[2][14] In April 2017, Haynes starred as Billie Holiday in Zach Theatre's Lady Day at Emerson's Bar and Grill.

In June 2022, Haynes performed "Gimme Shelter" alongside The Rolling Stones during their concert in Milan, Italy.

[17] After Hurricane Katrina in 2005, Haynes co-founded the Trin-i-tee 5:7 Ambassador of Hope and Triumph Campaign to provide financial assistance to the colleges, hospitals, businesses, and churches.

[18] In addition to financial assistance, Haynes also donated her personal time to help uplift the hurricane victims' spirits.