We have a Female Veiled Chameleon that almost never changes color. We have had her for about 3 months now, she has grown from 3 inches (body not including tail) to about 5 1/2 inches (once again body only). She seems to always stay this bright dayglow/ lime green color. When we take her out of her cage ( we have a 24"x24"x48" reptibreeze for her) she likes to sit on our head or hand but always stays a bright green, should I be worried?