Craig came down and picked up a trap the next morning, and they had the mother cat captured the next day. The kittens are in pretty rough shape---skinny, with infected eyes and runny noses, but with plenty of energy left. Poor little Fern, the mom cat, was initially terrified but was quickly won over by food once she was here in a cage.
After she had her second meal of the day, she rolled around and around in her bed---probably happy to not be hungry for the first time since she stopped nursing on her own mother. She's absolutely emaciated. She has enlarged nipples, so she definitely is the mom, but there is no milk to speak of for the kittens, so I have been feeding them pedialyte and KMR.
Pictures of the kittens soon!