You seem so sure.
Since she was excluded by the authorities, yes, I'm pretty sure.
What gives you even the least bit of hint she did it? I've never seen any evidence, just stupid speculation, that she was involved.
On the other hand, I wasn't there, but neither were you or anyone else that's pointing fingers. A good portion of the evidence collected still hasn't been published. It appears that no one has the foggiest idea who actually did it.