that's a hard one. I know she is just in love with that puppy, but I promise, she will be in love with any puppy that you get her
can you find another yorkie pup...that maybe looks similar? I just hate to support puppy mills like that. I am sure she will fall in love with her new puppy....especially if you get one from a reputable place...that you know for sure is healthy and all.
another thing to tell her,...more often than not, when you get a puppy from a puppy mill or a place where the puppy has lived in a cage it's whole life, they are really hard to potty train. she will end up getting very frustrated and angry if she has such a hard time potty training a puppy. not to say that one from a reputable breeder will be "easy" but you have a MUCH higher chance of training the puppy easier and quicker if you do NOT buy from a puppy mill. Just another thing to think about. I got maggie from a place where she was raised in the house with a family and she was potty trained VERY easily.
it is so hard to not fall for that baby and give him a good home. I totally understand that. but you really just CANNOT support these places.