Covering the area with aluminum foil or double-sided tape is a great deterrent. These surfaces don't have a texture that feels good to scratch. Remember too that Kitty has marked her favorite spots with her scent as well as her claws. You may need to remove her scent from the areas you want to distract her away from. You will find pet odor removers in pet stores and many supermarkets as well.
Cats have an aversion to citrus odors.
Use lemon-scented sprays or a potpourri of lemon and orange peels to make her former scratching sites less agreeable to her. If Kitty still persists in scratching the furniture, try squirting her with a water gun or a spray bottle set on stream. Another option is a loud whistle or other noise-maker. You must employ these deterrents while she is scratching for them to be effective. The point is to establish an aversion to the spot you don't want her to scratch.