I have no idea!
I have a budget of roughly €20, her DM laughed at me for thinking so far ahead (so far ahead!! I am almost finished and wanted to get finished in the next 10 days).
For her birthday, I got 4 different colours of packs of gems to stick to fabric, so that she could personalise her coat, bag, etc. Not sticky ones, the ones with prongs at the back that stay put (so not a cheap present exactly even though small).
I got a good board game to play with the family last year. And a nice, teenager-y (rather than character) set of PJs and slippersocks the year before.
I have bought her 5 year old brother a lego set, and will probably get her 9 year old DSis sports stuff but 13 year old is losing interest in sports.
What is trendy rather than naff stuff from old fogie DCousin (who is practically treated as an aunt, as my DD is the same age as Dsis of this cousin - so THEY see themselves as cousins).
To further complicate matters, DD has bought a book for each of her cousins except 13 year old (cos she didn't know what book to get) but also something small to go with the books. So I will need to get something small from DD as well (probably in reality another €10-15).
So any ideas are gratefully received as to what would be good.