personally think that if you give her a gift, she won't care no matter what it is, because what she values is not the gift, but your intention. The gift is not important, but the sentiment is important. Aries girls yearn for freedom and like fantasy. If conditions permit, you can accompany her to travel, climb mountains and see the sea together, and feel the charm of nature.
Of course, if you don't mind the trouble, you can also make some things for her by yourself, such as (paper cranes, little stars), etc. Don't think that this is only for girls. I believe that when you give her such a gift, it will definitely touch her heart and make her feel that you are a considerate and gentle person, and even want to marry you.
By the way, it is best to create a romantic atmosphere, just like in idol dramas, so that she will definitely follow you. Haha, the above is my suggestion, I hope it can help you. I wish you happiness.