As Sierra waited for Hades to respond, she wandered a few feet away in search of something else. She wasn't so far away that Hades would think she'd just turned away from him, but she was far enough away that she could look for other items, too.
Looking down at her feet, she noticed that she was standing near a small puddle of water. Not too small, though, for something was floating deep inside of it. At first, she stepped away. Something mysterious in the water? Down here in the Chamber of Secrets? Nope. Not for her. She wasn't idiotic enough to just stick her hand down there and see what happened.
That is until the object floated more to the surface, and she could see that it wasn't really anything dangerous at all. At least, not this fake version.
"...and now a diary," she said to Hades, scooping it up.