If for some reason, your bird does not step up, you must teach her to do so. By teaching your bird to step up onto your hand, you have managed to show her who is in control and to teach her a valuable lesson. She will now understand if she is in a dangerous situation, she can look to you to step up out of it. After an initial snuggle period and a good scratch wherever your bird enjoys it, you can begin to teach or encourage your bird to do many things that will challenge and excite them. It gives them something to think about and helps to prevent boredom.
Some people think 'trick training' is at best unnecessary and at worst cruel.
Birds in captivity are really genetically programmed identically to birds in the wild. They are 'built' to constantly search for food, look for a nest site and evade their predators. If we take these activities away from them, which we do by taking them into our homes, it is our duty to provide substitute activities for them. It is the only way to ethically keep a bird in captivity. In addition, it is widely accepted theory that birds do not respond well to negative reinforcement.