As I understood from your message, she has everything materially but you can just choose an other type of gifts for her. I really recommend you to look through various experience gifts, it's such an unreal type because they're very interesting and give such nice memories! For example, my daughter got them for me not for once, I really liked that certificates for spa-salon, massage and art masterclass for quilling, I found a new hobby for myself after visiting it
Also what about her hobbies? Does she like anything except cool clothes and jewerly? You can get her for example an interesting book, tickets for concert/art exhibition, cooking gadgets, music CDs, cool pencils or wooden models www.kickstarter.com/projects/1469570445/wood-trick-0 if she's a creative person and likes art, good coffee or tea, also various handmade gifts like postcards, they're very beautiful and many people adore them too
And of course the last idea can be just money, in this case she can buy later what she wants, however is she has everything materially, I'm not sure if she really appreciates such gift...