Birthday present?

A friend of mine has her birthday on Sunday and I could give her an Amazon voucher, but I still have time to get something tomorrow but I NEED AN IDEA!

So, she likes anime, listens to Queen and Nirvana, and is very interested in philosophy and psychology. But she's already read all the books, from Hobbes to Nietzsche, and everything, so I don't know what to get her. It doesn't have to be anything crazy, but does anyone have any ideas on what I could get quickly? By the way, she's turning 16 and has purple-blue hair, if that helps 😉

Please help! thx