How about getting her a fossil hunting kit? This would have all the tools a fossil hunter needs such as a rock hammer, chisel, collecting bags, and fossil identification guide. Additionally, you could get her tickets to a fossil hunting excursion, where she can go on an organized fossil hunting trip with experts and other enthusiasts. Another thought could be a membership to a fossil club, which would give her access to group fossil hunts and activities. Lastly, you could get her a book on fossils, such as "The Fossil Hunter" by Shelley Emling or "The Rise and Fall of the Dinosaurs" by Steve Brusatte.
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.