Spaying didn't slow Ellie down a bit.
I used a onesie after surgery.
No food is a concern for small Yorkies but the vet should be able to handle that because they SHOULD give her IV fluids. I would be nervous also though.
Ellie was in pain even with meds. Some girls take it worse than others. Please insist on pain meds. They might even make her sleepy which is good for healing.