How about a professional face painting kit? She can use it to practice and perfect her skills or even do it as a side gig if she's interested in making some extra money. You could also set up a surprise face painting session for the two of you, with some pictures to commemorate the occasion. Additionally, you could purchase a pretty photo album to store the pictures in, which can be a special keepsake for the two of you.
Or you can get her a star map with the date of your anniversary.
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.