Look for a necklace or a bracelet that you think she would like, that way you don't need to worry about her ring size or whether or not her ears are pierced. Think about getting her birthstone or something personalized like an engraving.
As the saying goes, 'diamonds are a woman's best friend' and they're forever. Not that we're asking you to gift her one even if it burns out your bank account. You can gift her some classy jewelry and, in turn, see the sparkle on her face.
Is she into the latest gadgets? Look for a digital camera that would best suit her needs and pair it with a digital picture frame. Pre-load the frame with pictures of friends and family so that she has something to enjoy.