Ralph never chewed on the walls, but he did try to chew on some furniture I would suggest more chew toys, and more chew sticks, like himilayan chews, bully sticks, antlers. If you have already tried that i would suggest trying this:
Bitter Cherry Taste Deterrent Spray | Ralph the Poodle
I had a client who used the spray on her hands and furniture and her dog stopped. But I would try going to petsmart and getting some chew toys and such first, maybe she is teething or loosing her baby teeth! If you want to get her some chew treat I would go to
http://www.doggyloot.com they have great deals on bully sticks and Himalayan chews all the time, and i haven't been able to find chew sticks cheaper (: