Well, I for one would like to see a redemptive arc for Quinn because I like the whole "bad-girl-gone-good" thing, and I'm also quite partial to those aloof, punk looking girls as well.
To me, it feels like she just went with the easy option in financing the HOTs (drugs and sex), and maybe she already had some connections with people who could set her up with drugs to supply to people in the college. It's impulsive, brazen, and doomed to fail, but she thinks she has a handle on it and the arrogance will be her downfall. But deep down I think she knows she's getting in too deep, especially since she looks shit scared during that scene with Riona when they're discussing the order for the Jocks.
Quinn needs a good (metaphorical) kick up the ass to set her straight, and having some serious repurcussions for her actions would do just that. If the Cathy pic causes serious problems for the DIKs and this in turn causes problems for her businesses, it could land her in trouble with her supplier(s) and then, whether by hook or by crook, she enlists the help of the MC and over the course of these events she learns valuable lessons, makes amends, and becomes a better character.
This is something I'd really like to see for Quinn, and even though she could still be a spunky spitfire at the end, she'd be a better spunky spitfire who doesn't use people anymore or gets in deep with bad people and illicit ventures.