The necklace is a great idea! I got my 12 year old granddaughter an initial necklace last year. I think your sister would love most anything. Is there something she really loves, like cats or dogs or music or something like that. You might be able to find a necklace that symbolizes something she really likes. Make sure the chain is sturdy enough - I know teenaged girls are pretty hard on the chains and I wouldn't want her to lose it!
Good luck! You are a sweet big sis!!!
