Your elder sister is a teacher. She has taught you a lot since you were young. Haha, it is really good to have an elder sister. She will take good care of you since you were young. Of course, you will have the deepest feelings for your elder sister when you grow up. So it is understandable that you often want to give her a small gift. It is also a very good idea. It can let your elder sister know that you have grown up and deepen the relationship between you.
It is recommended to give a simple little gift, such as a crystal music box with photos of you and her on it. Putting it on her desk will make people envious. She will like it very much. You can also look at other gifts. There are many good little gifts. I hope there will be a gift you like. I hope it will be helpful to you.