Will the stray cat I've taken in instinctively know how to use a litter box, or do I have to train her?

She's only about 8 months old and actually a little "wild" too. She's used to eating insects, mice and anything else she can catch. I've allready started her on kitten food and she loves it. My old cat passed away a couple of months ago so I've decided to take this one in. Never had a "wild" cat before. I can use all the advise I can get.