Don't let her pig out at every meal and she should be fine. Toda hasn't gained a pound since being neutered in December. One of the female cats I had was spayed at 8 weeks and by the time she was a year old, she was 16 pounds. I didn't overfeed her or anything. It probably depends on your dog.
Oh yeah, get her into some serious stuff like spring pole, make her work the calories off. She'll thank you later when she looks in the mirror