Which is stupid because if you throw a stone and she cuts the future where the stone landed then suddenly you never threw a stone to begin with or you now have a flying anti-gravity rock.
This isn't cutting a thing. This is redacting history so that the future never happened. Except unlike all other forms of time shenanigans, you aren't preventing something from happening by acting on it, you're just ripping out chunks of the future and hoping the universe doesn't implode on your stupid ass.
And if that somehow works? All tension in the story, voop, GONE. Mom dead? Cut cut cut. Never died. Friends a bitch? Slash slash slash, she never was. People acting against you? Slice, slice, slice, purely their imagination.