At 7 months old, she is still growing, legs, mouth, and all. Whether or not that's something to worry about is more of a question for your vet. =) Many dogs, especially bulldogs of any variety, have over/underbites. Yours doesn't seem to look too terribly awful, but again I would just double check with your vet. I wouldn't freak out too much. =) Relax, and just give the doc a call.