Fair enough. Like I said in my letter, if it was just AvPD, I doubt we'd be friends. I am definitely not the most gentle and thoughtful person around.
As for thinking about my own problems, trust me, I do. I'm finding the information on Schizoids quite interesting. I wouldn't say I'm to the point of a disorder, but I would say that in a lot of ways I have a Schizoid personality.
As for trying to diagnose her. Well, I've known there was something... off about her for a long time. I'm consistently the one putting the effort into making the friendship work, and I was honestly surprised when she indicated that she was willing to put in effort to keep the friendship going when we weren't living next to each other. Friendships need to be a two way street to work, and there's a difference in the level of friendship between someone you know in your apartment complex, and someone you go out of the way to see.
It's basically a case of moving to the "next level" in a relationship. I honestly hadn't thought about doing so beforehand, and since she is the way she is, I needed to look for other ways of figuring out what I was getting myself into. In the end, does it matter if it's a full blown disorder? If she shows all the signs of being a Compensatory Narcissist with an inversion caused by our initial fighting, then I can say, "this fits what's been driving me crazy about her!", and I can have a better understanding of what she's looking for. Now, I do think it's a full blown disorder, but in the end people are more then a bunch of medical terms. She has had serious issues living her life due to the way she is, but it's her life. I'm just trying to make sense of it.
On top of that, I've always liked to learn new things. Trust me when I say that a lot of my research has not gone into this case. For me, learning new things about the world around me is just fun.