[Cha Cha]

I know all puppies chew, but my 7 month old eats everything she chews. She started off being a poop eater and I know there are several different opinions on why they do that, but now that the weather is nice I can't keep her from chewing and eating the sticks and mulch in our yard. I know she is literally chewing it up and eating it because I am seeing the results. She would prefer to chew and eat much or a stick, leaves, branches, or anything dry and dead, over a bully stick. She recently got a clean bill of health, teeth examined, and she is on Wellness puppy. Can she be deficient in something in her diet that is making her crave raw wood? If I were to try a vitamin/mineral supplement, which one would I give?