She is known for her role as Kate Howard on the ABC daytime soap opera General Hospital, which she portrayed from September 2011 until August 2013, before reappearing briefly in October 2014.

She also played Sage Warner on the CBS daytime soap opera The Young and the Restless from October 28, 2014, to June 22, 2016.

Sullivan played Kate Howard and eventually the character's alternate personality, Connie Falconeri, on the ABC daytime soap opera General Hospital from September 2011 until August 2013.

[4] In 2016, she was cast as Bonnie Hayes in the Tyler Perry drama series Too Close to Home on TLC.

[5] Sullivan got her first Broadway show role in Contact at the Vivian Beaumont Theater in New York City; she also was featured in Bells Are Ringing and Young Frankenstein.