1.5 year old dog destroying belongings.?

My female boxer has habit of tearing up the first thing she see's when my family leaves. Today I stayed home and she didn't notice. About half an hour after the rest of my family left I got out of ben and the first thing I saw when I walked out into the family room was a torn up log carrier thing. It was ripped to shreds and sitting next to it was my boxer, shaking and and giving me the "I didn't mean to" guilty puppy look. So now I know that she tears stuff up in the first 30 min i'm gone but I don't know what to do! This past week she's torn up 2 sleeping bags, 1 temperpedic pillow, the log carrier, torn a whole in her own dog bed wreaking a her blanket, and 1 slipper.I can all ways tell when shes done something bad because she wont come in the house! A couple weeks ago she tore up a sheep skin rug, which gives me reason to believe that our older dog isn't Innocent! I know it's not out of boredom because she has all these different toys scattered about the house! Can some one please help me! I swear i'm going to go broke if this keeps up!