How about an Hermès scarf or a silk twilly? They are beautifully crafted and come in a variety of colors and patterns. If your mom already has a few scarves, you could also consider an Hermès bracelet or a classic handbag like the Birkin or Kelly bag. Alternatively, you could book her a spa day or a weekend getaway to a luxury hotel or resort, which I'm sure she would appreciate.
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.