I dont think an extra bun will lessen her destructive issues. May make them MUCH worse. I have had Carrera 4yrs and Pookie 2yrs and they dont care for eachother. So you could have a WHOLE different war on your hands!
My advise is to step it up a notch. Spray the carpets with perfume. Give her more boxes and paper bags to destroy. We have a big grocery bag in the living room with small baskets, small plain pieces of paper, phone book, pinecones, chew toys, etc. So when the buns come out they hop in the bag and find something to pull out and play with. Those Quick Cement tubes from Lowes or Home Depot that are like 4ft long 8"wide are great for buns to run around it and play and destroy (less than $5).
We keep extra paper and cardboard rolls and magazines all over so our buns have distractions from destroying carpet or walls. Works most of the time. It will surprise you the amount of things she may ignore initially but will catch her eye at a later date if you remove it and bring it back at a later period. Remember anything can be a toy- lid to a detergent bottle, empty medine bottles with a penny in them, stuffed animals, etc.
If you give her more things to catch her attention then she will have more to occupy her time and less to destroy the floors. The areas where our buns pulls the carpet we have these cheap heating pillows that we lay over it and they are too heavy for our buns to bother to move so they move on to something else.