I, too, had to go through a very similar situation a few years ago. Anyway, we got Lady, an abused purebred rottie as a 5 year old rescue, and she joined our rot/Aussie mix Natalie, who was 2 at the time. They grew very close over the years. Natalie had always had extreme separation anxiety along with a host of other neurotic behaviors. At about the age of 13, Lady went downhill very quickly and had to be out down. Bast darn dog I've ever had. We left Natalie at home, it was hard enough bringing Lady in, let alone dealing with Natalie at the vet.
After we got home, Natalie was very withdrawn and depressed. About a week after putting Lady down, Natalie disappeared. I've never found out what happened to her, but no one let her out, left any doors open or anything. I personally think she left so she could go die on her own. It was absolutely heartbreaking, but I don't think there was anything we could've done to ease Natalie's pain. Hopefully your girl will deal with it better, but really there's no telling how an individual dog will deal with the loss of a mate. My advice is to give her extra attention and keep her occupied.
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