Hello there!
I can give ou a couple of suggestions that have worked for me...
show kitty where the box is, don't move it around as it might confuse kitty. Put her in the box, take her paws and help her dig in the litter so she gets the idea. Since she is just a little thing, it wouldn't hurt to put another box on the other side of the house. Just remember accidents will happen..clean it with natures miricle and move on.
Another thing that wouldn't be a bad idea is to crate the kitten or put her in a room with the box. I have done this with many foster kittens with great success. Cat attract is a good kitty training aid..Call different pet stores to see if they carry it. Some vets may carry it also.
Hope that helps. Don't forget to spay her when she comes of age!
missy