my girl is 18 (almost 19) weeks old and she is roughly 33-35lbs and last time i checked her height (about a week ago) she was 19" as well... Your girl will grow dont worry lol and some never get that big, my last GSD (female) was only 45lbs full grown and roughly 23in at the shoulders, I personally like smaller females... How big were her parents, weight and height, thats normally an easy way to gage how large she will be, she should turn out to be closer to her mothers size... hope this helps