Birthday gifts should be based on blessings. Giving handmade DIY birthday blessing chocolates is a very special gift. Girls like to eat chocolate. Now satisfy her desire. It is not only edible, but also has its unique charm. It can be written. Writing blessings on chocolate is also a great wish. I hope your classmates will like it.
I feel that there is no need to care so much between classmates. Just give similar gifts. If it is a good classmate, give a better one. For ordinary classmates, just give ordinary gifts. You are still students, so don't buy those very expensive gifts. If you buy expensive gifts to fill your face, you will be the one who starves. I also came from that time. You can give some relatively affordable and special gifts, such as crystal inner carving tables of constellations, sun jars of zodiac signs, etc. as gifts.
Whatever gifts you give represent your blessings. I believe your friends will understand. You should also tell her your blessings. If you have time, you can go out to celebrate together.