Ditto all of the above. If this is the case and surgery may be a little too much, you can place her on Glucosamine.

This will help regenerate the joint fluid and ease the friction between the bones more. Doesn't cure it and isn't an overnight fix, but it does help minimize the pain and makes moving a little easier.

Also, if she is displastic, do not breed. If she came from a breeder, please inform the kennel of the outcome. This helps monitor which lines are more prone to having it show (if they are reputable breeders).