Go to a flea market and buy a bunch of tennis balls. They are cheap there, I think I have brought over 100 because my dogs tear them apart eventually, lol. Just load a bucket and throw them for her. When you run out, go pick them up, try and aim for the same general area so you don't have far to walk. Another way would be to throw a ball, after she catches, get her attention, show her the new ball, and see if she will bring the one she has back. If she does, reward her with treats or pets and repeat. I taught Dawn to retrieve a little. She stops before Rascal will, but she retrieves. My trainer's jaw about hit the floor when he saw a Siberian playing fetch, lol.
i will try that