1. Since your sister is a college student, you can't give her something too childish and too childish. I think you can forget about dolls. You can give her a makeup mirror, cosmetics, nice hairpins, etc. Anyway, we are all family and you are the younger generation. It doesn't have to be expensive. It's okay to show your love.
2. College students must dress up and love beauty. None of the sisters in our class go out without a makeup mirror. There are all kinds of cartoons, landscapes, one-sided, two-sided, etc. I think this one is quite practical and cheap.
3. College students must live in dormitories. The little girl must not be used to sleeping alone when she just moved into the dormitory. You can give her some bigger dolls, such as squinting rabbits, big-mouthed monkeys, teddy bears, Hello Kitty, the kind that can be hugged to sleep. It shouldn't be childish. College students should have one or two.