Husky Shepherd problem help!?

One month ago, we adopted a Husky mix from the pound. She is well behaved, and gets along fine with my other dog. The husky has anxiety and tried to chew through the front door the first time we left them alone, so I have to cage her while I'm at work. She will open cage latches (now locked) chew through locks (now have bigger locks), kick the tray out of the cage (locked it in), chew through the tray (now made of steel), dismantle the cage (reinforced with master links). She destroys anything chewable in the cage: blankets, etc. except a Nyla-Bone, she won't touch it. She must have too much energy & she is frustrated. I know the importance of exercise but she shows no interest in toys or playing. I bought a treadmill she is terrified of, and long walks just aren't doing it! She is starting to hurt herself trying to escape now. Her poor nose has a sore and is caked with blood every day. She hides in the morning to avoid the cage. I have tried making it her den, she hates it. Any tips?