For now, I'd try a tube of Nutrical for dogs - have her lick it off your fingers if necessary - it is high calorie, vitamin rich and has been known to bring extremely sick undernourished dogs back from the brink. I used it on my female post jaw cancer surgery and it helped her gain back her weight. I would definitely make a trip to the vet.
Riley - 8 yr. old GSD
Schatzie - GSD - at the Bridge
Raven - GSD - at the Bridge
Diablo - WGSD/Arctic wolf/GreatPyr Mix - at the Bridge
If dogs aren't in heaven, why would we want to go there?