Another thing that may help is a topknot pillow. Some groomers and breeders make them. It's a U shaped pillow that your dog rests it's head in while you work on the topknot. It can be very relaxing for your dog to lean into it while you comb her hair. A member sell them. Her user name is topknot!
http://www.yorkietalk.com/forums/yor...beds-more.html
Hope she starts adjusting to the routine soon. Perseverance is the key. Just take it a little at a time. You won't get it perfect at first but be patient and you will eventually perfect it.
You can also roll up a hand towel and put it under her head to serve as a pillow while you groom her head.