German Shepherd wrecking home

Question
I have a 5 month old GS who is adorable and very well behaved, until you leave the house. She went through a stage where she was brilliant.  Had even stopped going toilet in the house.  She had all her toys and they entertained her.  My partner has been off for a month so has been at home and now has just went back to work.  Over the past weeks she has started getting into cupboards, taking things off counter,  chewing furniture, pulling books out of book case,  riped cat flap off door (dont have a cat)going into bin and peeing and pooping everywhere, even opening doors into rooms and pulling the wardrobes apart.  She knows shes not allowed to do it and when you come home she hides because she knows shes done wrong.  Really need help, my house smells off poo and her peeing on my wooden floor has caused the wood to absorb the scent so everywhere stinks of pee as well.  Not to mention the fortune it is costing to fix everything she has broken, smashed, riped.  By the way she is like huddini.  You can lock her anywhere and always manages to get out.  

Answer
Hi Arlene,  Your dog is suffering from separation anxiety.  Your partner was off work during an important part of her life (during the last part of the imprinting process of her life).  So now she is in a panic due to your partner leaving her.  I need some questions answered before I can help.

1.  Where did you get her from?
2.  How old was she when you got her?
3.  Is she spayed?
4.  Has she had any formal training?

Let me know the answers and I can give you some advice.

Dawn