A friend of mine bnrought me a maori carved thing on a necklace that was blessed with a fertility blessing by a maori elder. I wear it all the time! And my SIL gave me an angel whcih I carry most of the timed in my pocket. I'm very touched that they thoght of it. And yes it's very personal, but she's your sister! If you can't buy her something personal then who can?