Surprise her with a fabulous imperial Faberge jewelry egg.  

From 1885 to 1996 Faberge Eggs were the ultimate achievement of the renowned Russian jewellery house and must also be considered the last great commissions of objets d’art. 

You may not have millions to buy the real Faberge.  But giving a great imitation shows you've thought of her in terms of what is best, high culture and great HERstory.