The parents look good to me. I guess that "boxer" look could have carried down from a generation or two back. She does not look much like a bulldog. Her chest is narrow and face seems too long. She does look sweet!!! If your not breeding her, I'm sure she would make a great pet. I would not pay the full bulldog price.
This may sound off the wall, but it is possible that she wasn't actually from that litter, and was just added to it in hopes that people would buy her thinking she was purebred? The mom, dad and the rest of the puppys look purebred to me but she doesn't see to fit in with the others.
With the crazy things people do these days I wouldn't put it past anyone..
Sorry i have a 14 month old english bulldog, if that lady tried to sell me that dog i would laugh. Please dont pay the money for a bad quality dog, it only supports the habit. The dad looks bad if you want my opinion that head is really awkward. Just know you have been warned, that is not a legit bullie. I do feel bad when i see some sites and people have bad quality, or not even purebred bulldogs, but they were suckered or fooled.