Why am 'I' the Villainess?

What is a reincarnated Villainess to do in a world where she has no idea what her death flags are? All Emilly, now Belladonna Von Gallowen, knows is that all routes end in her death. Nothing about how it gets there. Why didn't she pay more attention to her otome-game-obsessed friend? Edit: 50K reads? Thank you so much!