I haven't had a puppy for a long time, so I'm not sure about feeding them, but if shes not eating I would take away ALL treats. Our dog, who is eleven, was on Taste of the Wild, and after awhile stopped eating it, she is very picky. Its supposed to be a pretty good food, I think its grain free, which is good.
My puppy is a year old now. I recall how she would play with her food, then my older dog would do in and take what she left. I think it is like a child, they don't need as much as your giving them in one setting. Her tummy is small. I fed mine three times a day.
The food, I want to suggest that you buy her a large breed puppy food, the reason is you do not want her to grow too quickly as her bones will not be as strong. You are going to hear 1000 different suggestions on dog food brands. My vet had me using Purina Pro large breed puppy. I feed her about 1 1/2 cups morning and night and 1 cup at noon. If you can't feed at noon, don't worry about it, just feed her some a little later if you want.
Don't forget you can give a small piece of apple, banana, carrots as treats. I put apple in the kongs and she enjoys working on that. Oh, my dog is a BC, and will never be as large as your dog. Ask your vet for the correct amount of food.
Also, I would take her in to have her check out as she might have worms, or even be ill. Just to be on the safe side.
Please post back what you learn ~ Take good care of your baby :)