I've said before in the past that if Quinn was to have a real path, become an actual love interest, that the rain scene would be the very first scene on her path. It's an incredibly dense and interesting scene, and I've watched and analyzed it more than any other in the game, and for more time than I'd care to admit
In case it's been a while since you've seen it, and for the benefit of those who are reading this and haven't, let me set the stage briefly. Quinn goes to meet an old associate of her dad's, Buddy, to make a money drop and order a resupply of the drugs she peddles. When she arrives to the meeting spot, the apartment-slash-drug den that she grew up in, she bumps into an addled junkie that is probably her mom but who doesn't recognize her, despite the makeup on her face mimicking the tattoo that was on her dad's face. The following conversation ensues between Quinn and Buddy:
Now, you tell me honestly after reading that conversation: does it sound like Quinn is making any kind of power play, does it sound like she's interested in crime or drugs at all? I'm going to unequivocally state that I don't think she does, I don't think Quinn wants any part of the drugs, and it appears to me that she's done everything she could to distance herself from them. But despite that, the circumstances of her upbringing, and her life, have led her into a bad situation that she is trying to handle the best that she can, which she admittedly does poorly but she's only human. There's some hidden, crucial context in this scene we're missing, which is the true reason that Quinn is involved with the drugs at all. It could be because, as Buddy says, because Quinn is a daddy's girl, or it could be some unseen debt or threat that's forcing her to deal, but regardless I think it's pretty clear that Quinn does not want to be a part of this business.