Hi Tammy and welcome to Yorkie Talk. Congratulations on your new yorkie baby.
Yorkies can be fussy eaters, but I think your little girl might get better with the hard food once she gets a little older. Though sharp, her teeth are so small and still being a pup, she could be teething also. I've got a little guy (about 4 1/2 lbs full grown) and he still takes longer to eat than my other two. If the kibble is a little big you might try chopping/grinding it smaller for a while. If you're mixing in soft food also, keep in mind that she might be eating the soft first & getting to full to eat the dry. It doesn't take a whole lot of food to fill these little yorkie tummies. You might try putting just enough soft food in there to kind of coat the dry.
Good luck........we'd also love to see pics of your little girl and know her name