Bicarbonate of soda takes away smell, not great on black fabric though... but on lighter fabric it works. Sprinkle it and leave for a while and then vacuum it up. Try on a smaller area first in case it leaves residues. I sometimes mix a little fabric softner with water and spray on the fabrics in the house if we're having guests over, that also works but only for the time being.
And truthfully I think she'll get used to the smell after a while... We have 5 dogs, I'm sure our house smells but I can't smell it, nor do I care if it smells, dogs smell...
If couch covers don't work, get a different wife!