What are some of the fundamental differences between people who blackout from drinking and those who don't?

I’ve read the studies that reveal some people’s mind are predisposed to stop committing experience to long term memory in response to alcohol.

Personally… I’ve only ever experienced a blackout twice in my life, and both times were when I was drinking with Xanax.

If it comes to just alcohol on its own, I can drink until I’ve got the spins and I’m throwing up and hate life, BUT even then I remember EVERYTHING.

In comparison, I met a girl recently who seems to blackout very easily off hard alcohol. She acts about the same as she does sober, but her short term memory drops to 10 minutes or so, and retains almost nothing of the night the next day. Even stranger, in her case, she doesn’t seem like an alcoholic in the sense that she “can’t stop drinking once she starts.” I’ve hungout with her before where she happily drinks just a few beers and milks the last without ever finishing it. In comparison, I know someone who absolutely can’t/won’t stop drinking once they start.

Has anyone noticed any correlations between intelligence (emotional or otherwise), personality archetypes, or other apparent qualities that seem to be indicative of someone who blacks-out vs someone who doesn’t?