I like the keb's idea of a locket or cross - perhaps a pretty bracelet or pair of earrings (budget allowing)? A pretty handbag comes to mind - perhaps a lovely set of towels or linen? Something practical but pretty in her choice of colour for her bedroom? If she enjoys reading, a book that is suitable for her. If she enjoys crafts, perhaps some beads to make jewellry ....

Just a few ideas ...