Well, you have to remember that bunnies are all about eating, and paper, cardboard, and magazines don’t TASTE like anything. That may be why they’re getting ignored.
Willow toys and apple twigs are both dried out tree branches that taste good to a bunny… and are safe to eat. So I would go that route. There are many online stores (including BB) that sell these items. Pet stores don’t usually carry anything like that (they tend to just have the manufactured junk).
As far as a wood chew, if you want to provide that too, your best bet will be something you can anchor down. Rabbits get frustrated when they’re trying to chew something and it keeps moving away. Imagine trying to eat a sandwich, but you can’t hold it in your hands. You have to just bite at it while it lays on the table. Every time you take a bite, you accidentally push it further away from you. You’d be frustrated too!
I recommend an untreated plank of wood (like a 2×4), doesn’t have to be very long, and attach it to the bars of your pen at a comfortable height for your bunny. She’ll start gnawing on the edges.