Well, I'm off to the vets... Back in a bit, knowing more than I do now :~D
She's advanced but not yet full term, and the options discussed were to put her down, wait till term and do a c-section, or do a c-section and spay now. That's what I decided to do. What else can I do? She was purring on me. I didn't want to wait, and risk early labor at home that would end badly. If the kittens are alive and viable, they'll save them. He wasn't hopeful they would be. He didn't feel them move at all even when he squeezed them, but he said that's not always telling.
I talked to the vet a long time (I have a lot of history with this vet). We talked about how we had brought our kittens in early to be fixed so we WOULDN'T HAVE TO DO THIS!" and asked "Why do these things always end up on my doorstep?" I have a reputation as a sucker softy, I guess. He said "Well, look at the size of your file here... And I know there have been more that are in the deceased file".
Sigh, sometimes it's a hard world for the little things.
I left her there... they'll work her in today.