I'd definitely try the dog walkers, I think it could be fun for her. And you said you have a huge backyard, maybe the kids could come and play with both dogs there, too, some days. A good long tiring walk or playtime before you leave in the morning would be great, too - if you have a place to sit outside with your morning coffee and throw a ball for her, that could help.

That, and things to keep her busy - like a frozen kong filled with peanut butter, toys that she can play with ... all these things combined could make it better for everyone, and you and she might make new friends in the neighborhood, too.