I think it just takes time, after a few catches she will take it more seriously. Try a bit of lamp training. Get a torch and turn off all the light in the house, then get some tasty treats (rabbit would be best) shine the torch and drop the treats in the light. Get the dog used to associating the light with something good. Once the dog is used to eating the treats in the torch light, hold her by the collar throw the treat on the floor shine the torch on it, and get her all excited before letting her go to get it, you see where am coming from? Build up the training by moving it to the garden