Rescued 12 month GSD eating problems

Question
We have very recently taken on a rescue female GSD estimated at 12-14 months old.  She socialises exceptional well with all people and dogs and 'appears' to have settled in very quickly learning recall with her new name in just 2 days.  My question relates to her eating, in that basically she wont.  This is my 3rd GSD and I'm aware that these eating habits are common when GSDs have a change in their life and can take some time to get them into a routine for eating, but the problem is that she was found as a stray and is already very underweight.  She will eat the occasional Gravy Bone and a few licks of tinned meat, but all other food / treats just don't seem to interest her.  Is this something I need to stick out and wait for her to settle a bit more, or are there ways I can get her to at least put on some weight?

Answer
I would continue to offer her a dry chow and nothing else.  Give her plenty of attention and good leadership.    These are meant for younger dogs and she is too big for some of them.  

''Elevation for small puppies: Sit on the floor and gently put your hands around your pup's middle, below his front legs, and lift him up. He is facing you. Hold him for 15 seconds. Repeat until he no longer struggles. If he is past 10-12 weeks, lift his front feet off the ground, but don't pick him up.

Cradling for small puppies: Hold your puppy gently on his back, as you would cradle a small baby. If he struggles, hold him firmly until he quiets for 10-15 seconds. With larger pups, you can do this as your sit on the floor, with your pup between your legs.

Quiet lying down: Place your pup on the floor on his side, with all 4 legs pointing away from you. Use your hands on his neck/shoulder area and middle, to hold him in this position. When he is quiet, praise him. Lengthen the time that you keep him quietly in this position. When he accepts this position well, handle his paws and muzzle, while keeping him quiet.''

The quotes mean this isn't my original work. It is copied from my Puppy Raising Manual. I have long used these or minor variations of them, and they are very effective. You may want to give him a belly rub while he is on his back too. Helps bonding. There is a big difference between him rolling over and demanding a belly rub, and you choosing a time to roll him over and rub his belly. The latter cements your place as pack leader.

At the end of your meal, you might offer her small tidbits of your food.  Just tokens of the big dog's food to help bond.