I want to ask a girl out, but she does coke and I'm strictly straight-edge?

I came across this stunningly beautiful girl with a heart of gold that's smart as hell... but she does coke. I'm personally straight edge, I'm the only person in my immediate family that hasn't been a drug addict and/or alcoholic. It destroyed my family's lives; I sure as hell know that I don't want to go down that path. But this girl maintains a stable job, loving close relationships, good grades, etc. despite doing coke. Other than doing coke, she's like my dream girl (But I still don't know her that well, I've been observing her closely though and can tell a big heart when I see it).