Here is what I noticed. The shape of the nose seems different in the puppy vs. the 5 month old. Of course as the puppy grows, so would the nose, however, the shape seems different to me as does the amount of space between the bottom of the nose and the lip.
Did she send you other pictures from the time you chose your pup to the time you received her?
I also question a vet signing off on your pup that she was 12 weeks old. Why we he do that when you can see it is clearly an older pup.?.
Are you comfortable saying who your breeder is or where your pup came from?