Healthy pet store puppies exist.
I just wouldn't complete their genetic cycle ness. and breed her.
So I personally wouldn't worry about her health unless you're seeing specific symtoms of their being a complication! Relax and enjoy her.
I think one of the biggest crimes is that PetStores charge such a ridiculous price, especially for the quality and contracts they supply w/ their pups.
However, w/ that said, what's done is done and you're in love. So, just enjoy her and do your best to not repeat this EVEN IF you got lucky and she turns out to be the BEST Yorkie you've ever owned. Lightning rarely strikes twice.