well, this morning, we found Pal. She was back under the car looking quite forlorn (she didn't realize the kittens were up on the porch yet). I brought the kittens down to her and she investigated them quickly and immediately pulled them to her.
When I got home today, she was up on the porch. I put some more food and water out for her and after eating briefly, she went back under the car to tend to her four kitties.
I'd still like to find homes for these kittens if anyone is interested.