*Sigh* she looks old and tired. She needs a good couch to sleep on! Old dogs are NOT puppies, that's why we love adopting them! They like to sleep, they like to eat, and they like to play some, But just as happy sleeping!
Maybe she is thinking her behavior is depression when it is just old and tired... Could be dietary along with it as she is probably lacking in something having all these litters.... I know when a freind adopted her dog it had just had puppies and was on dog chow, getting her on a high quality and spayed energized her and put life into her.
Here is a tip for them, Reasearch the vet first, and pay out the extra $$ for some pain pills!