M.J.
When I was little, I distinctly remember my mom asking me why I never made eye contact. Heck, she even praised me when I did. I was diagnosed and medicated for ADHD, but I don't think that has anything to do with it. My main reason, as far as I can remember, was not wanting to be seen. I always thought that if I looked someone in the eye that it meant that they were looking at me and paying attention to me and I really didn't want that. I always preferred to stay in the back-ground.
I'm now 24 and I still rarely make eye contact. I've kind-of gotten over it by looking at either the fore-head of the person I'm talking to or the bridge of their nose. It's still a little bit of a fear thing, even if I know the person. Looking in people's eyes just makes me feel...wonky.
I suppose everyone starts doing things at their own pace, and if your doctor doesn't seem worried, I wouldn't worry about it if I were you. She'll start when she's ready.