considering Quin keeps being involved in most of the drama involving mc and diks so far, it would be both. then theres her reaction when she catches mc with sage, story seems to be hinting she will be how chad finds out or she will use it to blackmail mc, or both.
Sage wants Chad to find out, or do you think she tried to fuck the MC at the party in public by accident? she likes to play dumb but she knows what she's doing.
so far Quinn doesn't seem to be interested in anything related to the jocks so why would she go to them? what's to gain for her? i don't think she wants to get Sage's position, she seems happy enough being the VP, she has all the perks without any of the drama. But also, snitching on Sage would be against the HOTS rules, that would put everyone against her.
she already has a lot of dirt on MC, so if she wanted to blackmail him she would've hinted at it already but that doesn't seem to be her game.
so you do know what her intentions are, but her intentions are to fuck with mc, every way possible. she gets off on chaos and reaction, that much is clear.
we don't actually know what her intentions are, it's silly to pretend we do at chapter 2. you say she gets off chaos but i think she's a very goal oriented kinda gal. i can see her using all the dirt she has on MC, but only when she needs to.