First of all, you need to give her some easy-to-carry and memorable gifts. For example, a personalized makeup mirror is an item that every girl uses every day. You can give a personalized makeup mirror with engraved words to your foreign friends. You can engrave some blessings on it. When she returns, she will be very moved when she takes it out and looks at it.
There are also real dolls, which are very popular gifts this year. You can customize it with photos of foreign friends, or photos of you together. The effect of this gift is very realistic. When she sees it abroad, she will think of you. It is very good. It can be regarded as a souvenir to witness your friendship.
In fact, for her, studying in China is a very unforgettable thing, and you are a good friend during her study abroad. It will be very different for her. In the future, when you go to their country, or when she comes back, the thing you most want to do is to see each other, right? So a gift with each other's imprint is the best. The two recommended above are both good.