I misunderstood your question a little bit, so i started talking about the past,
but you meant the events that are happening in the game now)
Nicole shouldn't tell Wanda about her feelings right now because Wanda isn't ready for this. There will be no miracle. Most likely, the path will close and that's it, especially considering that this scene is only available if Wanda's sympathy for Nicole is below 5 points. This is clearly not enough for them to have some kind of intimate conversation there. However, it is absolutely enough to close this path precisely.
Nicole now has the opportunity to gradually getting close and seduce her sister.
Step by step. Then it will work. Therefore, Nicole needs to continue to act in the same way.
At least I don't believe that the game will provide options for some kind of conversation if Wanda does leave the show.
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