How about getting her a unique watch case to store and display her watch collection? You can find cases with different finishes, materials and sizes to fit her collection. Additionally, you can look for personalized engraving of her name or initials on the case to make it even more special. Another idea would be to get her a watch from a brand she doesn't have yet in her collection, or a limited edition or vintage watch model that she finds interesting.
Or you can get her a star map with the date when she was born.
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.