I don't know but think she wants to kill all the vampires cos.. She wants to kill them so none of them come in her way while she is making plans to mess around with Damon, Stefan and Elena. She probably at the end wants to kill Damon, Stefan and Elena as well but wants to play with them first. But seriously i reckon we're gonna find out suivant season.. She is obviously going to explain her plans at the end ou something, but im just guessing, i don't know for sure. <3
I think the other vampires are angry with katherine cause she didn't help them to come out too and maybe they want to kill her and she just wanted to be careful, I mean 26 vampires could be dangerous for katherine^^
