I don't think we ever saw what happened after the bad endings where she died, it could be that actual murder is a step too far to anyone that isn't her brothers, they were trying to make her leave, not actually full blown kill her in their minds.
And now she comes nearly dead and if the brother told things right, they know it wasn't her fault and that she didn't throw a tantrum, hearing she was bleeding out and almost died could have also led some of them to think about themselves and their past actions, basically the prince slicing her neck made some people realize how awful they were or even they aren't going to attack a girl that almost died.