Try using an interactive toy to entice her out of hiding. I had lots of success with a makeshift fishing pole toy. I attached several strands of short ribbon to the end so that it wouldn't be so bulky or so noisey that it would scare the kitten. Seve...

You can't stop a cat from scratching but you can provide them with acceptable items to scratch. Sprinkling a bit of cat nip over the acceptable items will make them more appealing.
There is a wide variety of scratching posts available these days...