If your sister is willing to travel, I highly recommend Spomenka Newman in Lawrenceville, GA (Near Atlanta). She is absolutely wonderful. She has a warm, gentle way of talking to children which absolutely engages them, even if they are shy. She was so helpful to my family in helping us pursue occupational therapy (my son, like me, has coordination issues) and helping us find appropriate educational venues. She is very well versed in gifted issues.