I think she should be fine.. female labs are a lot smaller than the males. 57 lbs. is to me not really small and I hate seeing fat labs or fat dogs in general so she should be good. Show labs are usually fat. I am on that lab board too have been for years and there are a few people on there that show labs and they are fat. Even people who don't show them have some chunky monkey dogs. I rarely go there anymore.