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.
Your girl is a cutie by the way. Sweet face.
