Maybe get her a crate and when you are not around you can put her in there. My 2 1/2 yr old will do the same thing. The second you leave she chews something. Don't know why, but she does it. She goes in her crate when I leave the house for even a 1/2 hour. She has 3 other dogs to play with when I leave, and they never touch a thing. Crating is probably your best option. It will save your sanity and you valuables.. When she goes around tables, be sure you tell her no. Get a can, fill it with pennies, and when she goes to grab for something shake it at her. The noise will usually startle them and make them stop. Sounds like she is going through her teen years, and testing you.