No matter what, giving gifts makes everyone happy, not to mention that it is a gift from a boyfriend. I think she will understand that she is often busy, but giving a gift is a must. Here are some suggestions:
1. You can give her a beautiful small pendant. Crystal or gold are both very good. You can choose a cute one. Girls of this age are still very young.
2. Give her a creative gift, such as DIY chocolate. The sweet chocolate plus your sweet words will definitely touch her heart. You can also give her creative gifts such as couple cups or couple rings, and the couple will have a heart-to-heart connection.