The pics are a little fuzzy so it's hard to tell, but she doesn't look small for her age to me. Dobes mature slowly and the girls won't be as big as the boys.
Tali, my 3.5 year old, is approximately 60 lbs and she's definitely full grown. Tali even looks pretty good closer to 55-lbs. She's my little girl. 65-lbs is pretty typical for a full grown female Dobe. Since your girl is 7-months she's still got some growing to do and her growth will likely slow down quite a bit. She likely won't be her adult size until around 2 years old.
Yep, some dogs are just smaller than others. I think around 7 months old Keira was also around 50lbs, maybe just a bit more. Now she's nearly 4 years old and looks her best at 58lbs. I wouldn't worry about it at all! Dobermans aren't supposed to be huge anyway, and in a lot of ways it's actually nice having one just a little bit smaller than average.
my little girl has just turned 6 months and is 45 lbs thats funny that someone else thinks thier pup is small i have been worried too that she will stay small, hoping she will hit 60 lbs when matured.