I agree with ledefensetech, I'm a big time cat lover. It's always hard to give it time, because you just want to hold it and love it and play with it.
Sometimes, getting two kittens helps. I did have this happen to me once. I just got as close to her hiding place as possible, I would lay there, even if I couldn't see much of her. at first I was just very quite, then I would stat humming a tune. Later I would softly sing to her. One day while I was singing she started purring. Oh happy day!
Later I got some tuna fish and just put a small piece in the palm of my outstretched hand. I had barely started to sing when she peeked out at me. I swear she looked amused, then she came out and ate the tuna. When she was finished, she kept licking my hand. Finally she came up to my face and stared in my eyes. Then she just started to knead my arm and finally fell asleep.
I was in another room when she woke up, and she came to find me. It was the beginning of a beautiful relationship! She got to know others in the family at first, while sitting in my lap.