It is so much fun to watch them grow so quickly. My English Mastiff puppy is 25 weeks tomorrow and he is trending at 93 lbs. He weighed 33 lbs at 11 weeks. I have a female adult mastiff who is 2 years old and 130 lbs. It is getting more difficult to weigh him now that he is getting bigger. We used to be able to pick him up and weigh both of us on the bathroom scale, now we just take him to the vet once a week for a weigh in and a social visit. He soaks up all the attention when he is there. What are you feeding her and how many meals a day, just curious. Best of luck