One idea could be to get her a complete DVD set of all the seasons of How I Met Your Mother. Another idea could be to purchase her a personalized replica of the infamous blue French horn, which was a prominent symbol throughout the show. Additionally, you could also consider getting her a HIMYM-themed phone case or t-shirt. Another thoughtful idea could be to get her a book written by the show's creator, Carter Bays, such as "Barney Stinson's Bro Code" or "The Bro Code for Parents: What to Expect When You're Awesome".
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.