I HATE PETSMART.
I once bought a fish there that I knew was going to die because he'd been in the same dirty cup for months. I bought him just because I didn't want him to spend his entire sad life in a stupid miserable cup. I took him home and he happily lived out the last few months of his life in a big plastic tub I found for him.
I wouldn't encourage buying bettas from these places but I know we all want to do it.
Sorry your girl's so injured, I agree she's very lucky to have such caring owners!