Simply plonking down a few posts in front of your cat is not enough. You must specifically train her to scratch these items and these items alone. If your cat is not interested in them, it's up to you to show her how fun they can be. Put her favorite food treats on some of the platforms. Rub the post down with catnip.
Most cats scratch immediately after waking while performing stretching exercises.
As soon as your cat wakes up from a nap, call her to her post. Scratch the post at a point a couple of feet off the ground. Most cats reach up and stretch with their front paws on the post. Praise your cat profusely, especially if she makes scratching motions. Don't try to physically force your cat to scratch by holding her paws.