It takes an experienced and very patient person to "tame" a feral. It takes a lot of time. I would NOT try to catch her with a net. I would ask at you Animal Control or vet's office if they have a Have-a-Heart trap you can borrow and bait with something good and smelly, like tuna fish. Then you'd have to have a vet visit and evaluation - ask your vet if they have dealt with a feral before, if she is indeed 0% tame.

Have you tried searching http://petfinder.org for an adult kitty? I have never heard of there not being an oversupply available!