I'm not a lawyer, but my best friend is a former prosecutor and is now a judge. I haven't asked him about this scenario specifically, but I've chatted with him about some of the investigations and prosecutions he's been involved in over the years and my sense is this:
The fact that any prosecution will also want to pursue Burke, Quinn's father and anyone else involved in these criminal rings won't protect Quinn that much, especially if her cooperation comes after being arrested. MAYBE if she goes to the police BEFORE they are aware of these crime rings and agrees to help ensnare the entire conspiracy, she might be spared the harshest sentencing.
If she just gets arrested and Quinn can convince the cops, and probably ultimately a jury, that she was manipulated and under duress by Burke to essentially run the restaurant, she'd probably get some consideration, but would not avoid punishment. It seems probable that Burke is above Quinn with the restaurant, but is he also running the drug ring? Or is that a side hustle Quinn has? If it's separate from Burke, Quinn is also going to be in serious trouble for dealing drugs. The marijuana isn't such a big deal anymore in many US states, but she's also trafficking in stolen and/or counterfeit prescription drugs.
Bottom line, even if Quinn informs on Burke and her dad (who presumably supplies her with the drugs for sale) she is absolutely NOT going to receive "serious leniency" and definitely not probation. The fact that she appears to have grown up in a drug den, and maybe even got prostituted by her father when she was young, is tragic, but unless she has a rockstar lawyer, she's going to do prison time.
