Well, women tend to love being surprised, so surprise her. You could throw a surprise party or give her an unexpected gift for her birthday. Whichever way you do it, make it show your love and affection. For instance, you should not surprise her by paying all of her bills. That is not a surprise that makes much sense or has much sentimental value. Instead, you want to prepare a romantic dinner for her or take her out on a walk. Remember that some surprises have more meaning than others.
You can also surprise her in a way that makes her laugh. Show up at her doorstep wearing a funny costume. Tell her a series of distasteful jokes. When you make a woman laugh, especially on a spur of the moment, you will get on her good side.