Definitely:
Buddy: "So? The same as usual this time?"
Quinn: "Yeah...and..."
Quinn: "...add some coke."
Buddy: "Coke? You?"
Quinn: "Can you?"
Buddy: "No problem on my end. I'll tell Mick to add it to the drop-off."
Quinn: "Not too much. An 8 ball is enough."
Buddy: "Works for me."
Buddy: "But I gotta ask... Why now?"
Quinn: "A customer wants it."
Buddy: "That's not what I meant."
Quinn: "That's the answer that concerns you."
Her hesitance in asking for it means she knows Buddy will react, and his response, almost disbelief. I reckon her dad died from an OD. I doubt he went to jail over it, otherwise it's unlikely they'd still be operating from the same location.