You could make your own necklace for her, she would definitely wear it because it's form her relative and it's real... It's also easy to send thru mail.
The girl you're describing already has a Wii console and an iPad
. That's pretty much describing that she's rich enough to have any item she wants. The only thing I can suggest right now:
Beads & Necklaces - if she's into beauty and cosmetics
Athletic gears - if she's into sports
Books - if she's into reading
Special Wii games like Mario Kart or Tennis or Dance Dance Revolution or something like that
Hello Kitty toys and playset or Barbie dolls and stuff if she's into teahouses and doll collections.
Hoped I helped a bit.