It could also just be her thing.
When Miss Naja was a baby she chewed a little but got over it. Moo on the otherhand, we've nicknamed Shredder, if it's on the ground then it's fair game to him...Little bugger...He's more fond of things that are hard plastic, maybe your girl just has a thing for blankets?
One thing you could try though, is spray the bedding down in water and vinegar or Bitter Apple before putting it in the crate, don't soak it, you just need enough to coat the outside of it. It makes the blankets real yucky tasting, then she might be more apt to leave them alone...