The best way to tame a feral kitten is love and time - lots of both. Keep her in a cardboard box that is deeper than she can jump. Kittens cannot climb cardboard is they can't reach the top to grab hold. Put the box in the general living area of your house. Every time you walk past, talk to her. If you have a second, pick her up by the scruff, and hold her tight against your chest. You may want to use a hand towel the first couple of weeks - but don't use it to pick her up. While you are holding her, talk to her and rub her head and ears. She will make all kinds of spits and hisses and growls, but as long as you hold her close, she can't hurt you.
Ihave hand raised literally hundreds of kittens, orphans, ferals - everything. If you talk to her every time you walk past, have some kind of treat or something to give her. Then she will associated your voice and presence with good things. You will feel like it is no working, but you will notice - rather suddenly - that she will still growl and spit but will give up the fight. Good luck and be sure to post pictures.