Our feral cat and her friend are back from the clinic, spayed and vaccinated, flea-dropped and dewormed. It turned out they were both already pregnant. They'll never have to go through the stress of another.
The vet estimated that feral Mama has three babies out there somewhere. She was released as soon as she recovered. No signs yet of her return, but I'm optimistic.
Tortie is taking a recoup in our spare bedroom and is doing extremely well.
I'm so relieved. And very tired.