What is this movie: teen heroin dealer

Edit: Solved, it’s “Christine” from 1987. An episode of ScreenPlay.

I have a movie on the tip of my tongue but cannot remember what it is. It’s about a teen girl, I think it’s Scottish, and she walks around her town with a plastic bag selling heroin and helping her customers shoot up. The problem is if you search “teen heroin scotland” in any form you just get Trainspotting. Might have been a TV film originally? I don’t recall it being that long, possibly sub-90 minutes.

I have it in my head that the name is something suspiciously close to a more famous teen heroin movie: Christiane F. I feel like it’s something close to that, “Christina” or maybe even just “Christian” but I could be wrong.