If she's a vertical scratcher you could prop a scratching pad up against the new piece? Just a bit of old carpet glued to a board would do it, perhaps? You can buy them too, think I saw one on Zooplus. If you rub catnip into the fibres she'll prefer this to the wood.
Don't forget that scratching is also a means of scent marking, I read that they have scent glands in their paws and scratching distributes this, so they don't see scratching as norty, simply making themselves at home.
