I found where she had them. My husband has an old camper shell in a dilapidated shed along the fence line. I found the old clothes where she gave birth on them. No kittens. Either they all have died or she's moved them. After we buried the others she would disappear. Now, she's just laying out in the front yard. Unusual for her.
For those who suggested we catch and neuter them, we live in a rural area. Feral cats are a necessity to keep the rat population under control.
These wild cats don't starve. We stop feeding them scraps and cat food when we find mice in the house. They get hungry and start eating them again, then we start back with the food.
I seriously doubt you'd run out of feral cats. Spayed and neutered ferals are more healthy than intact ones because they don't get worn out breeding and don't get into so many fights which cause injury and spread terminal illnesses. Even when they do die you'll probably have new ones wandering in. Some places will spay or neuter ferals for free, the most it's likely to cost is $30-50 each.
> They're dead. I buried them both in the same shoe box.
:( Well, they're with Freya now...
> Now, she's just laying out in the front yard. Unusual for her.
Likely despondant. At the very least, she's pondering "Well now what do I do?"
Give her some treats. Leave milk, Whiskas, whatever on the same spot where she left her kittens.
If nothing else, note that of all the options available to her, she looked to you as the one who could help. She had *hope,* as vain as it was. She might be skittish of you, but it means that she respects you at some level as something rather more than Big Monster.