I think it's better to give her an unforgettable birthday and give her a surprise, depending on whether you pay close attention to her at ordinary times. For example, when you are shopping, she especially likes an ornament or a dress, and that store doesn't have the right size or color for her. At this time, you can go to a jewelry store or a clothing store to help her find the one that suits her. She will think that you are very attentive. You can also do something by yourself, preferably with you, to make her think about you all the time. Then have a romantic candlelight dinner.