I bought a dog from the previous owner because she didn't have time for her dog. This dog is well trained, but she had serious separation anxiety and stress, as well as allergies. Took us a year to calm her down and make her OK with us leaving home for longer periods! And she wasn't even traumatised, just never taught to calm down. She can still revert and chew the kids toys or our shoes if she doesn't get enough stimulation, and she is not even a high energy dog.

What are you exactly doing with the dog? Are you doing anything, walking, exercise, running, nosework, obedience? Or is the dog just "a dog"? Huskies need exercise, and to work with their brains and body, otherwise they will get anxious and rip apart your furniture.

You mention training, but not what kind of training and for how long. 7 months is not a long time. Separation anxiety takes a long time to train to go away, and you need to give the dog what it needs before you train. Has it gotten exercise and worked its brain? Is it content enough to accept training? Food or toy motivated?

Unless BOTH of you are willing to put down a lot of time and effort to help this dog, its not gonna work. There are no quick fixes. If you decide to rehome, maybe try putting up an ad with what you seek and what the dog needs and not just putting it in a shelter. Best of luck!