Eek...I can imagine what you went through with ONE heat cycle! I hope Bailey wasn't too interested. LOL My neutered boys still go mental for a female in heat. Thankfully though, out of sight out of mind. Even a gate seperated was ok (phew). Anyway....
I'm sure she'll do fine. Feed her at 9...or maybe even a little after. I figure with raw...it digests quicker so even if she was fed at midnight I bet she'd be ok.

They figure most people feed kibble & you know how long that sits around. (though are you using the natural vet for her or the other?)
Anyway, make sure to request IV fluids!! It will help keep her temp up during the procedure. Lulu had a hard time with her temp after she had her dental work done & I'm quite sure it's because they didn't give IV fluids (they didn't ask me so I assumed they would where she is so small *my mistake for assuming!!* but she was just under 4lbs so not nearly as small as Lacey. That was a different vet than what I'm used to--my old vet basically doesn't give a choice for the smaller ones!). So yeah...request IV fluids to keep her blood circulating a bit better. Lulu didn't take to anesthesia very well but the rest of mine were fine. Hopefully Lacey pulls through just fine. I don't think it's so much the size of the dog but the individual dog in how they take the anesthesia. She's a tough little bugger so that's a good thing.
We'll be thinking of you!!!