Since she is a very good friend of the opposite sex, you must cherish her and buy her a good gift. If you don't want to appear ambiguous, you can give her something that she can use on a daily basis.
1. Give her school supplies, buy a better pen, or a notebook, buy a more distinctive one, or buy a meaningful book, the commemorative edition is the best.
2. Or give her a small potted plant, a cactus is good, it is very beautiful, and it can be placed next to the computer to prevent radiation, which is very good, good for health, and very easy to raise, it is a good choice.
3. You can also give electronic products, which can be used by both boys and girls, and it is not easy to cause misunderstandings. Give a mouse pad, a radiator, or a keyboard, which can be used on a daily basis, which is very good.