It is not just you who cannot attend such a friend's wedding, it is also a great regret for her. When a girl gets married, she wants to gather all her best friends to increase her popularity. If she cannot go, she must give a good gift to save her face.
Because you cannot attend the wedding of your dormitory sister in a different place, you can buy a good gift and express it to her, or you can order a gift on some special gift websites and let the seller express it to her.
Since you have a very close relationship with each other, it is recommended to give a very special gift. Whether it is expensive or not is secondary, and it must be a blast. You can give a bamboo slip imperial edict with words such as "must be happy" written on it. It has a somewhat majestic tone. You can ask other friends to help read it out. In addition, with a golden rose, it looks very atmospheric.
Other creative wedding gifts for sisters are recommended: real wedding dolls, wedding costume teddy bears, crystal piano music boxes, makeup mirrors, etc.