Maggie was born and raised in Birmingham, Alabama before attending Elon University, where she received her BFA in Music Theatre. Upon graduation she received her first lead role in the feature film, Alice's Misadventures in Wonderland, and moved to Los Angeles shortly thereafter.

Maggie is best known for her various roles in TV shows such as Grey's Anatomy, The Last Ship, Jane the Virgin, and most recently, Modern Family. 

Maggie lives in Los Angeles with her husband, director/editor Banner Gwin, and their two children.