When you want her to come out of her cage, show her your hand/finger to step up, and before she gets there, show her a reward. If she knows how to step up (with no pushing into stomach, no lifting toes, etc), then once she steps up, offer her the reward (it must be a reward that *she* likes, will not work if it is not a reward she has no interest in). If she doesn't know how to step up, then reward her for coming closer to you, reward for touching you, reward for one foot on you, jackpot reward for stepping up. Don't do just one reward, but as many rewards as it takes for her to understand that the closer she comes to you, the more she gets rewarded for doing so.
When it comes to going back inside the cage, you may need to show her her rewards and put them in her treat dish or food dish. Teach her that going back to the cage can be a good thing.