Anyone know what I should write in a funeral guestbook for a schoolmate that has passed away?

Well, we knew each other a bit but not very well. She had passed away Friday, due to a horrible accident. Tomorrow they’ll bring her corpse to the school and there’s a funeral guest book put at the school hall & I wanted to write something in it for her but I don’t really know what I should write.

So what can I write for her?
She’s into anime, she’s nice, quiet, outgoing, loving, Asian, she’s only 20.

I wanted to write something in a japanese/anime thing for her in the funeral guest book but I don’t know what. Help please.