Marshall was raised in Enid, Oklahoma. She began acting before she could read, and never really learned to do anything else (aside from reading, she really mastered reading).
Marshall has lived and performed in New York City for the past six years. She can currently be found performing Off-Broadway, or doing underground(literally) improv shows.
She holds a degree in Theatre/Arts Education from New York University. Marshall is active at the Upright Citizens Brigade Theatre where she completed the Improv program, and was accepted into Advanced Studies.