Is there a trigger that ends Eileen's questline?

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I'm at the last part of Eileen's questline where she lies in front of the Grand Cathedral and I have to fight the hunter inside.
If I continue playing without doing the fight right now, is there a trigger where the fighter and Eileen will disappear (e.g. after a certain boss)? I want to complete the questline, but first I'd like to progress and level up more to fight the hunter. I just don't want to come back later and find that I missed my chance.
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Can I still do Eileen the crow quest?
Eileen won't appear again until players defeat Rom, the Vacuous Spider midway through Bloodborne and the Blood Moon sets over Yharnam.How do I complete Eileens Questline?
After defeating Rom, the Vacuous Spider you will find Eileen at the top of the steps to the Grand Cathedral. You must assist her with the hunter encounter inside the Grand Cathedral to complete her quest line.What happens if Eileen kills you?
Players can at any given point kill Eileen, but will only receive the Crow Hunter Badge. This will fail her questline, and players will receive nothing else. This means players will lose out on a special attire, two gestures, and a special Oath Memory Caryll Rune.Come On Eileen In HD/HQ Restored Official Video
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