MY adult daughter has a condition called Raynauds Disease, if you google it you can find some good information on it. Basically, her hands and now her feet react poorly to being cold. They don't turn blue, they turn white, pastey white...and they tingle and hurt, like they would if they were asleep. I have carpal tunnel syndrome, which effects parts of the hand, and I have often wondered if there is a connection to the two since they both seem to involve circulation to the extremities. Has your physician actually been able to observe your daughter when she is reacting like this? I would think that would be very helpful,so that he/she would know exactly what you are referring to. As far as the weight gain, if she is eating well, and is other wise healthy and happy, maybe you just have a slender, petite little girl on your hands!!!