Fit was born in Miami, Florida, and raised in nearby Hialeah, Florida. She is of Cuban heritage. She attended Florida International University where she was a member of the Theta Xi chapter of Alpha Xi Delta.
Fit made her acting debut on the 2006 Nickelodeon television series, Zoey 101, in an unspecified role. She made her first recurring role on the American daytime television medical drama, General Hospital, where she played Mercedes from 2007 until 2012. She also wrote, directed and starred in the web series, The Subpranos, playing the role of Denise Flores de la Rosa. She also appeared in episodes of Southland, House, General Hospital: Night Shift and The Middleman. In 2012, Fit returned to acting with Filly Brown, where she played Lupe Tonorio.
In 2013, she was cast as CheeChee in the Disney Channel Original Movie, Teen Beach Movie. In 2015, she played Florencia "Flo" Fuentes in Pitch Perfect 2 and reprised her role as CheeChee in the DCOM Teen Beach 2. She later returned as Florencia in 2017's Pitch Perfect 3.

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