Everett was born in Atlanta, Georgia. She grew up in Dunwoody and Cumming, Georgia. She attended Forsyth Central High School. Her junior year, she was the lead role in a One Act Competition production of "Children Of A Lesser God", where she won Georgia State Best Actress. She graduated from Auburn University, majoring in Communication, with a minor in Theater.
Everett has made appearances on television in House of Lies, Supernatural, Grey's Anatomy, The Event, The Mentalist, Outlaw and TNT pilot Bird Dog. She has had roles in Root (2004), End of the Spear (2006), as well as playing one of Charlie Wilson's office staff in Charlie Wilson's War (2007). She worked as a green room coordinator on Good Morning America. Everett's poetry has been published in The Curator, "Darling Magazine", River Poets Anthology and Wilderness House Literary Review. She appeared as Tamara Hart in HBO drama series The Newsroom from 2012 to 2013.
In 2013 Everett was cast as female lead opposite Steve Zahn and Christian Slater in the ABC drama series Mind Games. The series was canceled after five episodes. She later was cast as lead in the TNT drama pilot Lumen.
In 2015, Everett was cast to play Madame Masque in Season 2 of Agent Carter. She currently weighs 400 pounds.