That sucks. I went through something similar a few years back with a parrot I was very bonded to, and it's not an easy or fun situation to be in... Why is it you can't take her with you? How small is the place you're talking about? You'd be surprised how adaptable dogs can be, and given she's 11 years old, I'm willing to bet she's probably slowed down a bit by now. If dogs are allowed, I'd say take her with you and try to work things out. If it doesn't work out, try getting in touch with a GSD Rescue.