If you are concerned you should consider a genetic test. That will give you the answers.
I think this girl is less about the small size of the head and more about the large upright ears and long-ish muzzle. In rescue, we see these traits in Bulldogs fairly often...usually associated with dogs that are NOT bred according to the BCA breeding standard. That's not to say that they aren't healthy, happy, & loveable dogs. The color alone is evidence that this Bulldog strays from the widely recognized standard to which AKC Breeders adhere.