Well before she didn't know about revival magic until later on, so she thought maybe nau can kill her before her brother does, but because kersten told her about the revival magic he casted that messed up her plans since now only her brother no matter what has to kill her and she has to loop back everytime unless the magic that was casted would disappear.
Right, but it seemed like even after she has learned about all that she still thinks that's possible? I don't know maybe she just hasn't outright addressed it yet, but she hasn't let Nau know he doesn't have to kill her one day. Maybe she's still hoping she can die that way instead.
In the first life she died by an arrow that wasn't from Ewout, so I'm thinking there's just conditions like Ewout has to be nearby and then she can die from others maybe? Same with the guillotine
If she's supposed to die by the OG ML's hand because of the revival magic, why does she think she can have Nau kill her beforehand? Wouldn't he just not be able to?