wonder what age group your female classmate is in? Girls of different ages have different preferences for gifts. I hope my suggestions can help you!
Birthday gifts are mainly based on blessings, and practical gifts are better! You can consider giving her a set of skin care products; if you want to be creative, you can choose to customize her exclusive bracelets, rings, etc. on some gift websites. I wonder if your female classmate loves plush toys? If she likes, you can give her a glowing teddy bear pillow, which must be very comfortable to hug at night.
No matter what kind of gift you choose, whether it is affordable or expensive, it contains your blessings for her. Don't forget to tell her your blessings in person, I think she will be touched!