If two people are truly in love, no matter what gift you give her, I believe she will be very happy. If you want to give her a special gift, I think you can make it yourself, which can better reflect your intentions and make your girlfriend more moved.
For example, you can fold a thousand paper cranes for her, fold 999 paper cranes and put them in a very delicate bottle, put the sweet words you want to say to your girlfriend in it, and give it to her on a romantic night, which will be very touching to everyone.
You can also fold a wishing star for her, put it in a wishing bottle and give it to her, telling her that no matter what wish she has, you will help her realize it, which will definitely move her to tears. In short, if you want to give a special and unique gift, you have to be attentive, and it is unique to make it by hand. I hope my answer can help you.