1) Her intelligence. She's very smart and wise, I find it makes me more attracted to her.
2) Her voice. Gaaaah, her voice. I love it. She's very well spoken and slightly posh. I love her voice.
3)Her kindness. She's a good hearted person, and she's always so kind and caring towards me. And she always gives me a kind smile, it puts me at ease.

I could probably write more than 3, but I will leave it at that.