It’s tough for a dog at an older age to adjust to such conditions. As it’s been said, continuity is the best thing. She’s been taken from what she’s known (for most of her life, I assume).

It depends on the emotional conditions of where she lives now – I watch Cesar Millan, and his philosophy seems to work most of the time. If there is too much sadness for the dog, the dog cannot move on. (You’d have to check out Cesar’s info on this, as I’m not really an expert). Basically, feeling too sorry for her is not really helping either.

I would recommend a vet visit, perhaps researching some of Cesar Millan’s info can help too. I hope the little one feels better soon. In my family, we’ve almost always had two dogs. When the older one passed away, the other would become depressed. After a while, we’d get a new young dog, and the old dog would bond with it, and get better.