[3] She has performed on Broadway in Hairspray as Amber Von Tussle and originated the role of Leilani in the Broadway production of Legally Blonde the Musical, understudying the roles of Elle Woods, Serena, and Margot.

[3] For this role she was nominated for the 2009 Helen Hayes Award for Outstanding Lead Actress in a Non-Resident Production.

In 2015, Gulsvig played Cynthia Weil in the U.S. national tour of Beautiful: The Carole King Musical.

In October 2019, it was announced that she would be succeeding Jenn Colella, who originated the role, in the Broadway company starting November 12, 2019.

It was announced on January 22, 2020, that Gulsvig would play her final performance in the role on March 1 and would be replaced by Rachel Tucker.