Alabado made her broadway debut February 28, 2011 playing a replacement ensemble role in American Idiot.

She moved to New York City in 2009,[6] and made her Broadway debut in 2011 as a replacement ensemble member and understudy in American Idiot,[7] later reprising her role in the show's first national tour.

[4][8] In 2013, she joined the national tour of Evita (based on the 2012 Broadway revival) playing Juan Perón's mistress.

[7] In March 2019, Alabado joined the cast of Mean Girls as Gretchen Wieners, replacing Ashley Park, who originated the role.

[12] In March 2020, Alabado started a YouTube channel to explain to her followers different aspects of how Broadway works and interview her fellow castmates during the COVID-19 pandemic that temporarily closed Broadway[13] After the pandemic ended, Krystina continued to upload similar videos about her experience as an actor.