Having dealt with English Mastiffs, it sounds like she's close to being where she should be, however alot will depend on her height (taken at the highest part of the shoulder). The suggestion of a side shot is a good one, You'd need it to look like this
And this is close to how she should look at proper weight at her age (Max was 1 year old and 145lbs when this was taken)

And this is close to how she should look at proper weight at her age (Max was 1 year old and 145lbs when this was taken)