Theland, with respect, I have to disagree with you. Although a feral cat can feed itself in the wild, letting a domestic cat out does not mean it will feed itself. If a cat has not been taught to hunt by its mother, it does not necessarily see mice or birds as food. Domestic cats whose mothers had no need to hunt will kill mice or birds for fun, and some will indeed eat part of them, but most domestic cats used to being fed by humans will become ill very quickly if left to their own devices. Please, do not abandon your cat and assume she will survive. She probably won't.