These things you describe about her sound pretty narcissistic to me. I have a relationship with a person who talks over me, too. It could be a trait of her possible undiagnosed ADHD, which I suspect she has but don’t know. But mine doesn’t put me down and act superior like your friend does to you. This friend sounds like an antagonistic person and not someone you enjoy a friendship with. Talking about mental health with her is proving to not be a good idea. Boy, we sure have all gotten into some deep discussions over narcissism, empathy, etc lately… the whole world is talking. But, it isn’t a productive conversation when it feels unsupportive, competitive. The mental health discussion becomes a means to abuse. I suppose it’s best to have the discussion with the professionals instead.