DD13 (gifted) has extreme difficulties looking at people in the eye. When she is walking by in the hallway after school, she has told me, she always has to look away because it makes her uncomfortable to know that people are looking at her. In fact, she can barely even look at a person when they are speaking. I don't know if that is unusual or what.
Bassetlover- I don't know if this just being 13 or not, but you also mention she doesn't like to talk abou much even with you...maybe there is more to it? Does she have people she is comfortable with?
