Chewing Wood and a Picky Eater

A couple of my does have been chewing on the wood on their barn lately. I am assuming this could be some kind of mineral deficiency, but not sure what kind. One doe that really likes the wood is my picky eater. When I bought her last year she came from a dry lot herd to my place which has pasture. She would barely eat her oats and would only eat alfalfa pellets, no temp, nothing else wrong with her. Her previous home did feed a sweet feed, so I assumed she didn't like the oats because they don't have molasses on them. I gave her a shot of Bo-Se and she started eating her oats soon after. She was eating fine earlier this year when I had the goats out in eastern Arkansas, they were all on grass there but it was different grass than mine. Brought them back and she went on strike again. I gave her a shot of Bo-Se and all she will eat is alfalfa pellets, grass and the barn. Sometimes she will eat a small handful of calf manna, but most of the time she won't. She will eat about 4 lbs of alfalfa pellets per day while being milked. She also gets some alfalfa pellets when I feed them to the rest of the herd.

So is the wood chewing related to a mineral deficiency? They do have free choice loose minerals (Manna Pro Goat Minerals) and they also have a salt block. Could the wood chewing/possible mineral deficiency be why my one doe will not eat her oats? Could the grass be causing her to not want her oats?

I am in north eastern Oklahoma and our pastures are mostly fescue and bermuda grass, there is some white clover (the short kind) out there also but not a lot.

I also just copper bolused all of my goats, I do them every 6 months. The picky doe does not have a temp, milk production is normal, chews cud and acts like a normal goat. She is 5 years old.

It has been about a month since I gave her the shot of Bo-Se and a week since I copper bolused her.