How about gifting her a new Dungeons & Dragons starter set or a new expansion module if she already has the set? There are also many books with the history and lore of Dungeons & Dragons that she might be interested in.
You can also consider gifting her a custom-made dice set or a dice bag with her favorite colors or design. Another option is to give her a set of character miniatures or dungeon tiles to use during her role-playing game sessions.
If she enjoys cosplay, perhaps you could buy her a new costume or help her create her next character costume. Finally, consider purchasing a subscription to a Dungeons & Dragons magazine, where she can learn new things and stay up-to-date with the latest gaming news.
Or you can get her a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.