You might have to wait till next season of Orange is the New Black to get Flaca's backstory, but in the meantime, here's some backstory on Jackie Cruz, the actress portraying Flaca!
Cruz originally moved to Miami to pursue a singing career; she instead ended up jumpstarting her acting career with a stint on Kourtney and Khloe Take Miami, Season 1 (2010)! See screencaps of her appearance behind the cut.
Jackie meets Kourtney in an art class, where they bond over their lack of art skills
They have lunch together, where Jackie reveals she left NY to get away from her boyfriend and that since coming to Miami, she has been dating girls.
Jackie takes Kourtney and Khloe to a lesbian club, where Jackie and Kourtney share a brief kiss.
The three go out again, and Jackie and Kourtney make out; Kourtney later feels guilty for leading Jackie on, and tells her she doesn't want to date.
Jackie reappears in season 2, where Kourtney uses her to make Scott jealous; it doesn't work and Scott ends up flashing them instead.
And an excerpt of Bitchin' Lifestyle's interview with Cruz, regarding her appearance on the show:
AP: Let’s get this out of the way – some people may recognize you from a couple episodes on Kourtney and Khloe Take Miami. Were you randomly at a painting workshop or did you have to audition to be part of the show?
JC: I always wanted to take art classes and I always passed by this art school on Lincoln road. I decided to sign up and Kourtney was in my class. It was all very random. I thought she was really funny and we hit it off quite well.
AP: Having appeared alongside one of the Kardashian’s in a reality show, do you think that it a positive or negative impact on your career?
JC: I definitely think it had a positive impact in my career because people got to know my name and what I was doing in my life. Kourtney is such a sweet person, and yes we are still friends. Now and than we text each other to see how we are both doing.
Source + S1E2/S2E4 of Kourtney and Khloe Take Miami