Although similar questions have been asked before, I hope this is not a duplicate as I'm not asking about whether I should inform my advisor (that's already decided), but how and when to do it.
My situation is a little different than most in that I'm a biology major, and hoping to study autistic spectrum disorders for grad school. Aspergers almost became my "special interest" in a way, and so I'm trying to incorporate that into my work. Under these circumstances, I would expect my advisor to be a little more sympathetic to my condition. However, because I'm not officially her grad student yet (doing a summer project before lab rotations in her lab, with the possibility to become a permanent student made clear), I'm not sure exactly when to tell her. Specifically, should I do it before or after officially joining the lab? I'm leaning towards before since if any problems arise because of this, I'd like to know beforehand and seek out other advisors. But I'm wondering if this could also create an awkward situation since she can't legally discriminate me?
Also, how much should I disclose about my struggles? Should I be matter of fact and just state that I have this disorder (assuming she understands the implications), or actually outline some of my challenges.