Short of getting her another dog to be with, or bringing her indoors...the only other thing I've seen people do for their pet in a similar situation, was to rehome them with a dog or dogs they like. I'm not suggesting that, though, because I don't know that I could do that. But, I've seen it happen like your situation, and, they couldn't take another dog, for some reason. They rehomed their dog and she was back to her old self again. I hope you all can find some way to make Maggie's life full again. Poor girl. She must be so scared being alone! I wish you the best of luck!