Well, I'm glad your little girl is eating, but why did you add milk instead of water? Cow's milk is not good for dogs. The enzyme lactase is very hard for them to digest. Think lactose intolerant in humans. It can cause upset stomach, with gas and diarrhea.
Also some (not often) dogs are allergic to the protein in milk.
You need to feed her what you plan to feed her long term. Don't start trying to intice her by adding other things, you will just create a very picky eater.
Set the bar for a healthy diet, and that is all she should need. Some owners end up dancing around from one brand to another, trying to find one their dog will like. If she only knows one food, she will figure out that is all there is.
It certainly doesn't mean you can't change foods periodically, but stay with a game plan while you get her settled in her new environment.
It will all work out.