It depends on her interests and hobbies. If she likes to make things with her hands, for example, you can make her something special. But choose something that will not be too distracting to her from you. One of the least things that you want to do is draw the attention away from you. An example of this would be a video game, it makes her eager to play it and takes the focus from you to the game. Give her something in which would make her heart swell up and make her hug you. But remember this: What is most precious is what money can't buy.