The growth is a good sign.  Did the endo say that any of the hormones are out of whack?  What should testosterone for a prepubertal girl be?  I always get a copy of my kids labs faxed to me.  If something is wrong it will have an H or an L next to the number and there is usually a normal range by Tanner stage for each hormone.  Your daughter should be female Tanner 1 which means she hasn’t started puberty.