Just in general most common people . (pet owners) don’t have a clue as to what a healthy weight is for their labs. It’s sort of both funny & sad how owners will take it personal if you insinuate that their precious champion ball fetcher Fiddo is overweight.
Like mentioned in another comment, it really depends from dog to dog, height, length, etc.
If she is active & energetic like you described I wouldn’t worry. She probably is actually a correct/ healthy weight & very fit compared to the vast majority of overweight labs, both American or English.