I'll bet she was pissed. No more potential followers to string along? And the ones who did it were her 'children' in the first place?

[ Not that Majima put much stock in that relation. ]

...Still, I can't help wonderin' why she's so eager to get rid of her weak spot. It might be true that it's hard to kill a bunch of monsters at once. But wouldn't it be more difficult to off a divine bein'?