I had bad results using wings alone. Using just wing parts, Logan felt they were carrion roadkill treasures to be devoured or rolled in. He never did that with a whole bird, ever.
I bought fresh killed pheasant from a game bird breeder to train, and didn't over-train with stale birds. See if you can just get her hunting.... if you can get a bird down, you can use that bird fresh for a few more retrieves as a better training tool.
I couldn't bring myself to buy the birds live to use tethered or clipped. I'll shoot at them, but I won't torture them. Too much of a softy.
I used to have a cat that would bring me birds, and snakes, and rats....:')