Marshall was born in Lahore, Pakistan. Marshall was introduced into the modeling world by her aunt, who runs a famous beauty salon in Lahore. She made her first appearance in a Garnier Fructis commercial. After doing a few more commercials for hair products such as Pantene, Head and Shoulders and Kuene, Suneeta disappeared from the world of television commercials.
Marshall made a come back as the Gul Ahmed new girl. Suneeta Marshall was on every Gul Ahmed billboard and in every Gul Ahmed spread in all the magazines. This was enough for people to notice this new up and coming model who was before only known as the Fructis girl. After her contract ended with Gul Ahmed, Suneeta decided to work with big fashion designers such as Deepak Perwani, HSY, Bunto Kazmi and Nilofer Shahid.