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If you haven't already, separate her from the mother cat so she doesn't get any reinforcement for "outside the box" thinking. Thoroughly clean any areas where mother cat has previously made deposits, using an enzyme cleaner designed for pet odors. Next, confine the kitten in as small a space as you can with the litter box, a bed, water, and food, and keep her there 24/7 -- visiting her frequently for petting, of course. (Preferably, this location will be the regular location of the litter box, so as to avoid confusing the kitten later by moving it.) Leave her there for a week, and then, if she is consistently using the box, begin gradually expanding her territory, a week at a time.
The logic behind this is that a cat won't urinate or defecate near its food or bed, and thus confining the kitten in a small space will motivate her to make her deposits in the box, where they are farthest away from what's important to her. Once the habit has developed, then letting her have more space should be safe.
Good luck!
I agree with separating it from the mother. I had a kitten that did that once because the mother had no litter box to show them (she went outdoors) and I could never train him. He'd use it if it were nearby, otherwise he'd go wherever was handy. It's hard to break the training a mother gives them, so start now!
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