Xena never tore up her bed but I have caught her flipping it over and scratching at the bottom. She likes to dig. I gave her this bone shaped floor matt to lay on instead of the tile floor and to put her toys on but after 2 months of nothing she flipped it over and chewed a hole almost all the way through, thus began her chewing phase. Then she chewed the doorframe in my kitchen. So I baught her a carpet cat scratching post. It is in the shape of an S and is made of wood and carpet. It did wonders. She loved it. She chewed on the corners, sits in the little u part and climbs on the small hump. Since then she has not tried to chew the doors or anything she's not supposed too. I would suggest getting a scratching post ( like this one
http://i00.i.aliimg.com/photo/v0/209..._furniture.jpg ) or something similar for her to chew on to distract her away from tearing up her bed.