She is probably asking because of the way his eyes look in the photo -- Yorkie pups usually reflect light with a blue cast. Nothing to worry about! That blue is expected! My little one looks the same if photographed head-on and the older of my two puppies already has the eerie green reflection. In person they will look nice and black. If they were clouded, I am sure the breeder would be aware.
EDIT: Wow -- we all posted almost at the same time.