CCN, I recall vividly feeling awkward and painfully excluded from social interactions as a child, too. I think, though-- and thought even then (correctly, I'm pretty sure) that this was largely the result of asynchrony. I presumed that it would disappear in adulthood. It has. In retrospect, much of being not socially adroit is a function of childhood, and GT children often have age-inappropriate opportunities to put our feet in our mouths in much more spectacular/obvious fashion than our NT peers. KWIM?
Yup

Asynchrony could definitely be the culprit. Particularly since I don't think a spectrum profile is something you outgrow, although you could certainly evolve and change.
Islandofapples: How pronounced are your DD's spectrum traits, and how delayed is her speech? A language disorder can delay speech quite a bit... I wonder if it's something like that?