It's likely the only thing that could 'save' Sage as leader of the sorority and possibly the sorority itself is if she initiated discovery of what was going on and brought it to the authorities in the first place. That changes the entire axis of the interaction.I think the sorority would be shut down and the president likely punished for failing in their role so epically, if it all comes out regardless of whether Quinn tried to shift blame or tries to take all blame herself.
I wouldn't be super surprised to see the plotline go something like Quinn pressures Maya > MC learns from Maya > MC takes wildly inappropriate thing (probably thing that isn't on Josy's list at all) to Sage > Sage is tipped off and starts to learn what's going on. Whether the various people along the way confide in or believe the MC is, of course, not necessarily guaranteed, but given that Maya's lesbian with no experience outside the MC, I would bet that causes some resistance that Quinn wouldn't expect and would cause even a Friends-only MC to learn about it.
MC knows he ordered Camila and can taunt Quinn with that fact during the CUMpetition; it also comes up if MC is a Huge DIK and can initiate the bathroom 3some with Mona and Camila.I think we're all overestimating just how much the MC really knows about what Quinn is up to at the point when he can warn Maya.
If you accept her number for the menu and specifically if you order Camila, he finds out in ep 2 that this seemingly random person on the other side of a glory hole was a HOT, but how would he know or even suspect that this has anything to do with tuition? Better yet, how would he know or even suspect that what Camila was doing was somewhat forced upon her by Quinn? For all he knows, it could be some form of freshman ritual/hazing, or just something that the girls like to do, and not anything to do with Quinn being a pimp.
So if he chooses to tell Maya to be careful of Quinn, it's not because he knows exactly what she's doing, especially since he also has no clue about the drugs either, but it's simply because he gets a bad vibe from her.