Semper Invicta: She will welcome the Sole Survivor into the ranks of the Brotherhood.
Quartermastery: Travel to a random location and find a piece of technology for Haylen.
Blind Betrayal: Haylen is furious when Danse is accused of being a synth. She is angry at Quinlan for acting indifferently toward Danse's life and pleads with the Sole Survivor to speak to Danse and hopefully spare him.
Precipice of War: She, along with Rhys, will need to be killed during the Railroad's assault on Cambridge Police Station so a vertibird can be captured.
pcps4 If Danse is spared during Blind Betrayal, Haylen may be removed from the game, making it impossible to complete Semper Invicta, without use of console commands.[verified]
pc If the Institute is destroyed with the Minutemen and Semper Invicta is not completed, Haylen will pick up her dialogue as though Danse was spared and he is at the bunker, even though he will still be in the Cambridge police station. [verified]