7 month golden retriever

Question
My golden is 7 months old and has started chewing holes in the middle of my carpets.  I have no idea why.  It started with the edges of the carpet about a month ago, and now she has graduated to the middle.  I've tried to keep her away from the areas like covering the holes but when I finaly think she has stopped, she does it again.  I could just cry.  I never had a golden that did this.  I'm going to crate her again for a couple of months to see if the bad habbit will stop, but I need to know what is causing this condition.

Answer
Crating is likely the best answer.  There aren't enough details for me to say why it is happening.  I am sure boredom is a big factor.  She maybe finding old spills or something.  You could try steam cleaning the carpet to eliminate anything attracting her.  I hope you don't have to replace it.  

I knew one little dog that ate the spot the sun shown on.