Have you talked with your vet regarding this? Has the dog been to obedience classes? Maybe talking with your vet and getting a recommendation for an animal behaviourist would help her and you to solve this problem. My parent's dog Moose was a stray that they took in and he literally destroyed our basement (he chewed through our well's power source and the basement flooded.) Anyway, my mom had an animal behaviourist come out and within 2 sessions, Moose stopped the destruction and became the nicest, sweetest dog. Check a behaviourist out.