She probably is. Did you get any papers with her? Did they tell you the registered names of the sire and dam?
It really doesn't matter, but it knowing who the sire and dam were, whether they are Brittish show line dogs, maybe, it might be why the muzzle seems a little long to Carmen.
From the pictures you have shown at this point, I would say purebred.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC
Hepzibah & Hannah