If your oldest has absolutely no social skills, you might want to consider getting her evaluated to rule out Asperger's, NVLD, vision problems, or other issues that might make it hard for her to pick up or act on social cues. Giftedness does not rule out the possibility of these kinds of problems, but it can help kids compensate for them, and make them harder to diagnose.
You might also want to check out
this book, and make sure any professionals who might be involved with evaluating your child have read it, too.
