I would stick with the suggestion of putting nothing but rugged toys in the crate with her while you are gone. If a dog is tearing apart bedding (of any kind) they put forth the risks of ingesting pieces of the rug/sheet/etc or choking on it. The same goes for toys if a dog is destructive as well, I would stick to hard toys, nylabones and kongs, or other rugged toys that won't risk choking or ingestion. Dogs unfortunately don't know they're not supposed to eat things that aren't food, and in my experience as a Vet Tech i've seen countless incidents of dogs with intestinal blockages due to eating foreign objects.
My college roommate got the grand idea once of putting a pillow in the crate with her 6-mo old shepherd mix puppy. We came home from work to find the puppy up to her ears in pillow feathers. Was hysterical, but a mess to clean up after she ran out and feathers blew everywhere!
My golden puppy stays in his crate with a kong and his small nylabone--no sheets or beds quite yet because he can't be trusted not to shred it to bits! I would wait until your dog can get past that stage before you keep making more messes (and risks to your dog)! My adult golden was around 2 years old before he got out of the destructive stage, but i'm sure it varies for all dogs
Laura