Crating is definitely the best way to
prevent the chewing but it doesn't teach the dog
not to chew therefore this can be a life long problem for some dogs. You can crate all you like but unless you modify the behaviour then the chewing habit will still be there if the opportunity arises.
I would try a deterrent on the furniture - you can try vicks or bitter apple or any other deterrent out there. I would pre-empt her habit and change it by getting up at 6 (before she stirs and starts chewing), letting her out for a wee and then putting her back in her room with something yummy she can chew on (and go back to bed for an hour!) and gradually extend the time you're doing this so it's a normal get up time and habit for you both. I think your ideal would be to be able to get up on your alarm, let her out, and reward her with a small something being such a good girl
With the mornings getting darker now this may be easier to do than starting in the middle of summer!
She's learnt a habit and habits take a while to break but it will be worth it to be able to safely leave her in a room - my dog trainer said you need to change a behaviour before a pup does it 3 times. After 3 times it's a habit and that will be harder to modify. Wise words