Those aren't clues, they are dialogue options
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Like I asked earlier: could you give me the dialogue that happens before you need to pick a clue ?
Because without proper context, I can't do anything but guess
How can you be missing this clue ? It's litteraly the whole thing that starts her Dark Secret reveal.
I am very confused by what you are trying to do here.
Why are you trying to reveal her dark secret, when you don't even know what it is ? (which you obviously don't since you don't have the clue that the game gives you when you learn about it)
Anyway, if I remember correctly, this is a clue obtained through Samarra when she reveals how she met Nell (which is when you learn about Nell's heritage for the first time)
Excuse me if I'm wrong, but I have the suspicion that you aren't playing the game and are just following the guide blindly. Because, and I'm repeating myself, there is no way on earth you could want to reveal Nell's Dark Secret if you don't know what it is in the first place
And I add my voice to the others in this thread:
STOP USING THE DAMN GUIDE