Having only one kitten is rather unusual. After four hours it's best to have the vet check her. If this is a first litter, and she's young, she might be having problems. If there's any doubt, it would be wise to take her to the vet.
Is she not nursing the kitten? If not, you will have to buy some kitten milk and a pet bottle and hand feed the kitten. However, if you can get the kitten to nurse, it will help to bring on contractions. Hold the kitten to the nipple, if necessary. Mother cat might need some help getting started. Also touch her abdomen very gently with your whole hand to check for movement or the shape of a kitten. (Do not push with your fingers or your hand; be very gentle.) I hope all is well. Please let us know.
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden