Girls all like jewelry, such as rings, necklaces, bracelets, etc. You can give such gifts to your sister, because you are her brother, and giving such a birthday gift will not have any bad influence.
Here is a little suggestion for you. If you think it is too vulgar to give your sister a ring or necklace, you can customize a name necklace or an engraved ring, which is specially made for your sister, with her name, very creative, and your sister will definitely like it.