I would also add that overexcitabilities seem to play a big role when it comes to gifted people being able to get along with others (and each other). DS6 and I have the opposite problem as you do with your DD, in that we're too much alike. We sometimes get into a tailspin when he gets worked up about something, then I get upset about the fact that he's upset, then he gets upset about the fact that I'm upset, and then... Well, you get the point.
What I'm trying to say is that relationships with GC are often just "more". So maybe you can take heart in knowing that you're not alone.
