Black Zenith [Adventure RPG / Chapter Four: Fires of Heaven]

Ofcourse you cant prevent it. Even if you stunned or silenced her that would only take effect for next turn, and both of those effects require a rather good roll. Assuming that you forget entirely about messing around with turn orders, it would look something like this

thunderpaw & myra
bohw
Echo's first action
razan
everyone else
echo's second action

I would advocate picking one course of action and sticking to it and not worrying about whether or not she might kill someone. Besides theres always the new death system, so even if somebody is brought down they still wont die immediately.

tldr; stop worrying and hope she doesnt roll twenties