I doubt that, since she also offers them to others. That would be a disaster for Stephen if he actually would be behind that because it would come out far too easily. And what leverage does Quinn even have. The girls would learn very quickly that Sage doesn't know about it and wouldn't condone it and then Quinn would be done for.
Again: It is just a bad plot point that actually does more harm than good to the story and the whole Mona plot could've been done differently (or cut completely) and very little to nothing would've been lost while it would've enhanced the believability of the story to begin with.
Take Quinn for example: With this plot point, she is just not redeemable anymore. She coerced young women to have sex for money and then taking the money from them. There is just no ambiguity about that. It is just evil and bad. Without that plot point, she would've been a bit of an asshole and would deal light drugs. While that isn't good, it would make her a lot more ambiguous as a character who can still return and do good, without having a permanent mark on her.
And Sage also looks bad in this. Her "daughters" get pimped out under her nose from someone she - for no apparent reason - trusts and thinks is a perfectly fine successor to herself, even though Quinn belies that assessment at every turn and openly so.