Obvious spoilers here.
So I just finished Act 1, got on the ship and started doing this and that, gathered my party, convinced the ship to do its thing.
Then a warning "dangerous stuff ahead, did you chose your companions, you might not be able to chose later on" or something to that effect. Obviously we got into a huge fight with Dallis and had to protect Malady from the bad guys and so on, it all went pretty ok I guess. After the fight I (Lohse) woke up in this blocky world. I checked my Journal and read that Sebille had died on that ship during the fight.
She and Beast were not in my party, but only her quest line was marked as closed because she died.
Does that mean I somehow fucked up / had bad luck? Could I have saved her? I mean she was nude (for reasons I don't whish to elaborate..) when the fight started so she might not have had all the armor needed to survive