Is your dog healthy? Is she eating healthy? Does she move well? Can you feel the ribs when you feel/rub down the side of your dog without looking for them? Then your dog is normal weight and height. There are so many different lines of OEM's some being on the larger side some on the smaller side...I have a 21wk old caucasian Shepherd that t 19wk she weighed 60lbs but she is on a larger than average scale...
Keep your dogs lean, healthy and dont over exercise and dont worry about the charts...they grow for 3 years and will bulk up overtime, so mature faster than others...
Good Luck