Beaver

So I will be moving Dezi to our new property this year. Barn is currently under construction, it is NOT a metal barn, it is wood. And I know Dezi. She is a beaver, not a horse. I dont plan on stall keeping her much, we have a nice set of pasture to rotate her through, once those fences are completed. However, does anyone have any safe suggestions to curb her wood chewing appeal for when she is stalled? I've never seen her eat it. Just literally chews it off and spits it on the floor and moves to another area. Im pretty sure out of boredom, however I've tried "toys" they don't get her attention at all. No jolly balls, no soda bottles or jugs on string, added some "treat" balls, etc. She really doesn't care for them. I'd like to stay away from "calories" as she is a VERY easy keeper, like seriously. Easy easy easy. She always has a salt and mineral block available to her in the stall as well. 

I'm hesitant to put metal near her. She once split her chest clean open on some metal. You know horses, if it is there they will find it and they will hurt themselves. She still has a big long scar on her chest from it. smh