A. Usually an obsessive and frantic behavior is stress related. It can be a coping mechanism. I would recommend getting her physically and mentally exhausted so she didn't have excess pent up energy to exert. Walking will never tire a dog out enough. You need to add running, jumping, obedience, play, getting them to sniff around and use their brain. Hiding treats and toys, hide and go seek and more training will equal a tired dog.
I would try getting some food dispensing toys so it occupies some time and gives some natural release as well.
Also providing an appropriate naturally satisfying release for her desire to chew. Use bones, antlers, proper chew toys, Kongs etc so when you catch her in the act, correct her with a stern NO then reward her for stopping, then give her something else to chew. Keep at it. It will get better over time. If you aren't there to "babysit" you may need to crate her so the chewing stops when you aren't there to control it. I would also recommend Having her teeth checked. She could have baby teeth which haven't come out.
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