I'm sure Mork's spay will go just fine, she is a nice healthy weight. Yorkies don't have any harder time with spay than other breeds, but the tiny ones are of more concern.
Here is a link to the soft collar I mentioned, so you can see it, even if you can't get one in time.
http://www.yorkietalk.com/forums/yor...ne-collar.html
You can get a newborn baby onsie and put it on with smooth side (back) toward her tummy and snaps up at her back. You will have to unsnap it for her to go potty though.
There is also a chance you won't need any of these, some dogs just don't lick and chew stitches.
My vet offered spay at a very affordable price, as an incentive to stop overpopulating. Also the local Humane Society here offers a $50. certificate toward cost of spay at any vet.
You might also want to get Mork microchipped while she is in there, and if she has any retained baby teeth this is a good time to have those removed.
Good luck. You might want to start a new thread in the General section, as more people will read there than in the Nursery (where we mostly see new litters of babies)
Love the photos of Mork and friends.