Hang in there Patches.

Sucks watching em swell up but hopefully she'll pull through.
There's not really much a Vet can do. You might give her some antibotics if you have any on hand. That's all a Vet would do anyway. My bird hunting pard is a Vet. He says it's a 50/50 chance with smaller or older dogs being on the wrong side of the 50%. I know it doesn't seen like it, but the further from the heart the better, and the head's pretty far away long as the throat doesn't swell to badly.

I've said it before on here and I'll say it again. Rattle Snakes and P-Pines are the only critters I kill on sight and without remorse due to the pain they've inflicted on my dogs and wallet over the years.

Good luck buddy.