Hmmm, this is interesting. Well, Yorkie's dont shed so it can't be the hair getting into your sinuses, maybe it's the shampoo/conditioner that your new baby is using?
Maybe it's something in her bedding too? Did you possibly change laundry detergent?
Or, maybe it's just a coincidence? I understand completley that giving up your baby is not an option so hopefully other posts will give insight into this subject.
I hope it all works out for you all.