The mom and dad of this litter were unapproachable, meaning aggressive dogs?
A while back there was a very long ongoing thread about someone who ended up putting their dog down because of aggression...and that dog had come from the exact same situation as your new girl did. Sometimes genetics are just too strong in some dogs and even socializing them well when young isn't enough, and it is a very sad thing.
I don't want you to think I am bashing on you or anything, I just think you have the right to know some of the possible outcomes that can happen when you have a dog from a byb like this.
I am going through hip problems with my young 7.5 month old, who was also purchased from a byb (little did I know until after joining this forum
). Luckily I was able to meet both parents and they were very nice looking and friendly dogs.
I hope you and your puppy the best of luck. Continue reading on this forum and elsewhere and educating yourself.