Anything she is interested in.
Board games, books, DVD’s, sporting equipment, a new bike, if she has a gaming system a new game, clothes, jigsaw puzzles, arts & crafts box, dolls, teddy bears, a lamp, a new doona cover, a mat for her bedroom, a trampoline, a CD player or ipod, framed pictures, chocolates, a DVD player, a tablet, a TV.
Ask her to write you a list of things she might like and go from that, you will still be able to surprise her because the list will give you a general idea of what to look for.
It’s hard when they grow up so quickly, best of luck!

Board games are great. If you’re living in a warmer climate with access to a pool or beach, water games and toys are always a thought. Kinda hard to suggest when I don’t know what she likes :/ Books and DVDs are always popular

My daughter is 12 and she still loves the Sylvanian Families or the Lego Friends. Could it be something for your daughter?