If you can use it every day, send a beautiful toothbrush cup, preferably for a couple, one for each person.
If it is more expensive, you can buy gold or diamond ornaments from Chow Tai Fook or Zhou Shengsheng. Other brands are also acceptable, such as necklaces, bracelets and earrings.
In fact, she will always remember you. After all, you loved her for ten years. However, you are not in the same city, so it is difficult to be together unless you really want to go to her city for her. Being a man, you can be impulsive once and impress her with your heart.
Otherwise, this is the only way.
Send valuable and durable things. Never give dolls or anything. Ask her about her hobbies and what her good sister wants most recently.
You'd better send it by plane or train. It's romantic. Plus a bunch of roses, girls love flowers without exception, so be careful in packaging. Write what you want to say in your heart, and be bold once!
Good luck!