Morning (-ish) update: Jazzy ate a lot, pooped a ton, and was doing binkies when I let her out. Her underside looks better although still slightly swollen. She had 1-2 drops of blood in her litterbox, which my vet sais is ok for now since she is eating/drinking/pooping/peeing and active, as long as the bleeding doesn't continue.
The blood in the nestbox was definitely from the dead babies. There must have been a larger injury on one, I couldn't bring myself to look too closely. I had wrapped them in paper towels and I could see that at least one had definitely still been bleeding slowly. I don't have a good place to bury them here so I brought them in to the shelter for cremation.
The new babies are now entered into the shelter records, and they promised to get my older babies listed on Petfinder as soon as I bring in some pictures, and to get the other shelter rabbits listed too. Hopefully that will drum up some adopters.
BTW for those concerned, the Sheboygan County Humane Society tries to be no-kill for rabbits and they've been able to go without euthanising one for well over a year. From what I heard about thatlast rabbit, it was an extreme case and then there was another long space without euthanizing rabbits.
I can handle the babies' expenses but if anyone wants to donate to the shelter please do! The dog section is quarantined with a very bad strain of kennel cough and I'm sure treating all of them is getting expensive.