Most Poodles have a natural retrieval instinct, but if yours doesn't seem to care about retrieving you can encourage her with treats or a tug game as motivation. Have your vet clear your Poodle for any physical issues or ailments which may make her reluctant to retrieve. If you are working with a Poodle puppy, take training slowly. Poodles are extremely eager to please and you don't want to stress your puppy's growing body with too much exercise.
Until you are very confident that your Poodle has a good recall and is dedicated to her fetching, only work with her on a long line or in a fenced area. While Poodles are highly trainable and one of the breeds most likely to learn off-leash manners, Poodles are very alert and aware dogs who can easily become distracted until they are thoroughly trained, so be very careful when working with your Poodle.