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Can you post pictures of her. I would like to see how thin she is.
Also, did they do any bloodwork?
What are you feeding her? And how much per day?
She doesn't look all that small in the picture. I know it's hard to tell with all that fur, but I'm not too worried here.
I would try to meal feed her if you can. This may take a couple weeks to get her used to it, but eventually dogs will get the hang of it. You put out a certain amount of food 2 or 3 times a day. The amount is based on what you are feeding. There should be a chart on the bag, as they are all a little different as far as calories per cup. My guess is it'll be ~ 1/4 cup 2-3 times daily.
If she's not eating right away, then I would add some canned food to the dry to stimulate her appetite.
If her bloodwork is normal, then it's probably that she's just not consuming as many calories as she's burning. In that case, the goal is to figure out how much per day she's eating and increase it by 10-20%. Checking the weight every 1-2 weeks and increasing or decreasing the food amount is the best way to manage it.
I hope this helps, let me know if you have any other questions.