She Eats anything that is wood

Lol, I was going to suggest the bitter spray. My dogs are now eating wood chips that are inside of my mom's plant. Maybe the wood just feels good on her teeth?

Have you tried Kongs or Nylabones?

How old is Eva and what breed?

A walk is great exercise but it's possible she needs more vigorous exercise. Yard exercise can't really be counted, especially if it's with an older dog. Most likely, Eva is terribly bored. She has gotten into the habit of chewing wood and now she can't stop.

If she is always supervised, it shouldn't be too hard to stop her, but I think she's doing it because she's bored.  

Yep Eva has both of those toys among many others like it

 Eva is about 9 months old and she is an ACD X (not sure what shes crossed with, the vet said American Eskimo, but I don't think I agree). Unfortunately my MIL is not very young so she is only able to do so much. It doesn't sound like much can be done while Eva is away from my care, but what would you suggest I do once I get her home if long walks and chew toys don't seem to help? 

oh a cattle dog mix eh? Yeah, she needs a lot of exercise and mental stimulation. Cattle dog mixes are usually very good at frisbee, agility, fly ball, etc. They have the drive to learn complicated routines and the energy to back it up. Invest in a few frisbees, some tug toys, a chuck it or 2 and so on. Get yourself a trick training book and start to teach the dog tricks, like weave through your legs, get the remote control, drop dirty laundry in the laundry basket, turn on and off lights, find things, etc. on top of the normal tricks like shake, wave, roll over, touch and so on. Try to do all of this by free shaping instead of luring with food. This makes the dog think for itself and teaches the dog how to learn. A 10-15 min free shaping lesson will really tire a dog out. Especially a drivey high energy dog.

You can also teach it things using a frisbee - how to go around your back and out to catch the frisbee. leap over your knee to catch the frisbee, low catches, long catches, etc.

You absolutely don't need to do all kinds of vigorous activity yourself if you learn how to tire a dog out by making it think and exercise itself (chase, fetch, etc) 

Wow all of that sounds like it might be alot of fun for her and for me. I keep saying I want to stay in shape with my pregnancy, and this will help lol.
Thanks for the ideas I can't wait to try these tricks with her, sounds like she might like it alot

Would you by chance have a book or video you would recommend for this kind of training, it's all very unfamiliar area to me. Thanks again! 

What I learned lessened that habit along with maturity...Is giving a nice big carrot stick, or a cored apple(seeds contain arsenic), and also peanut butter jars that are still containing the last of the peanut butter- 

The vegies that are crunchy are good for the teething, and I think some of the wood eating may be related to a great need for fiber.  Animals like monkeys do this in the wild to rid the intestine of parasites and it works quite effectively.  But carrot sticks are probably a nicer option than say your house shingles or kitchen table, Lol.

Also, the peanut butter jar keeps dogs busy for a while- also great if you don't want your company pestered by puppies...throw them one of those and they will be quiet for a while!