If you have been staying abroad, you will definitely feel homesick. When you work hard abroad, you need the care and encouragement of your family. The price does not have to be expensive, but you must make her feel warm and let her know that you care about her through gifts. Here are some suggestions for you.
You can give her a silver pendant with your sister's name engraved on it, or a necklace with a four-leaf clover representing luck. These are both fashionable and more personalized. Girls should like these exquisite accessories.
Real family portrait dolls are also good. When a person is wandering in a foreign land and misses home, taking out the real family portrait doll will give her some comfort. Looking at the real family dolls, she will not feel tired anymore.
In fact, if you contact her frequently and let her feel your thoughts about her at all times, it is the best gift. Sisters do not need those too gorgeous gifts. Talk to each other and chat, and she will not feel so lonely when she is outside.