From ripping stuffed animals apart to eating my shoes and various electronics

How did it happen? How did Marley go from harmlessly destroying her stuffed animals to crawling under my bed to retrieve my shoes for a nice gnawing session. Clearly I am not ok with that, so I showed her the shoes, said "NO, bad dog" and watched her stance change from happy to apologetic. A few minutes later I caught her crawling under my bed with that same shoe in her mouth.
The shoes, ok, they weren't expensive and they were not used all that much anymore (not very comfortable and sort of worn out), so I was annoyed, but not upset. Then came the day she decided to eat my PSP (Playstation Portable). Where did she get that idea? She totally destroyed it. I ended up taking it apart to inspect what parts still worked. Since it wont power on, I have to assume it it toasted. Along with the PSP, she destroyed a book Corinna was borrowing from a co-worker, and a picture of her and I. Earlier in the week, Marley decided to eat my Ipod charger, and most recently my favorite Nintendo 64 controller. Here is most of the damage:


And the repair: