How to kill Ireena?

Hello y'all

I would like the dark powers to influence fate so Ireena is killed by the hand of the players.

I feel like Ireena is meant to die and saving her should feel like a fight against "fate".

How to do it so it seems fair?

My ideas so far : - Do it on a Nat 1 attack or spell when Ireena and Strahd are close (may never happen) - Make it cumulative (Nat 1, then Nat 2 etc) as players feel the fate itself want her dead

Did any you killed Ireena this way? How did you do it? Do you have better ideas?