Quinn is not an amateur. She grew up in the milieu. One can assume that she is a professional.
The danger is that Quinn shies away from any form of consequence. She takes no responsibility for her actions.
Is she perhaps being blackmailed? Yes, possible.
But there are always those who blackmail and those who allow themselves to be blackmailed.
And even if Quinn is being blackmailed and she commits criminal acts as a result of this blackmail, it does not absolve Quinn of the acts. She could have said "no".
Therefore, Quinn is also guilty as charged.
Could there be extenuating circumstances at sentencing? Yes, it is possible.
Quinn's amazing criminal mastermind resume:
she wants Maya to fail in her race, Maya tricks her into passing the scavenger hunt.
she decides to take the HOTs to the preps to organize a super sale, the super sale fails
She thinks she can mend the relationship with the DIKs because of the good relationship she has with Tommy, Tommy doesn't even listen to her.
She goes to get drugs herself, gets robbed.
she decides to meet Rich's demand for cocaine, Rich gets scared and backs off, more (paid) merchandise to sell
She needs the money, all the girls in the restaurant work for free whenever they want.
She wants to intimidate Mona so she can't leak anything. Now Lily knows almost everything.
I don't think Rox would be proud....