She didn’t know how horcruxes were created, stored, or destroyed. But she knew it was possible to create one, and that previous horcruxes had been destroyed, so it was possible to destroy them as well. They could be inanimate objects, like a diary—were they only limited to inanimate objects? Better yet, was the diary  truly  inanimate? It seemed to have a life and mind of its own, and had communicated with Harry quite extensively and personally. 