She 'kept a diary' [=wrote regularly in her diary] while she was traveling in Europe.
(..) Unless we can destroy it. So, we were thinking... Well, Ron was thinking, it was Ron's idea. It's completely brilliant. You destroyed Tom Riddle's diary with a Basilisk's fang, right? Well, me and Hermione did remind where we might find one. Okay. Okay, but take this. (..)2011 Harry Potter and the Deathly Hallows: Part 2