In 2017 she joined the Broadway cast of M. Butterfly by David Henry Hwang starring Clive Owen and directed by Julie Taymor[4] as an understudy. Shortly before the show closed on Broadway she played the wife of Mr. Owen, when a cast member was ill. Also in 2017, Sweany played Kate Tompkins on Law & Order: SVU.[2]
Erica joined the cast for the second year of Harry Potter and the Cursed Child on Broadway as an ensemble member, aerialist and understudy.[1] Later in 2018 the feature film, How the Light Gets In starring Erica and writer Jude Severin was released, as well as Rockstar Games' Red Dead Redemption 2[2] where Erica played Mrs. Londonderry.
In 2022 Sweany returned to Harry Potter and the Cursed Child to play the role of Ginny Potter.[5]
Erica was featured in the film Birth/Rebirth by Laura Moss, starring Marin Ireland, as the opening midnight film at Sundance[6] in 2023. She then appeared as Florence in Amazon Prime's Dead Ringers starring Rachel Weisz.[7]
In addition to the performing arts Erica has worked in costume and production design,[2] ceramics, photography and iOSapp development.