Brooo that last line sent me lollll But on a serious note, I really wish she'd tell the M...

Exactly. Make it make some sense please. She tries so hard all along only to give up at the first sign of trouble. I would understand if she didn't know about the enemies brain washing technique, but she does. Yet, she still continues to act like she doesn't, wtf? She could do so much more and what does she do? Acts like yvonne isn't her problem and then goes around blaming the other characters. Like does she even want to leave anymore? Even goes as far as to ask if Yvonne is okay when they both its an act. Geez..

Exactly! She needs to tell someone!

But until now, she believed that there was no mutual trust between them. She thought the marquis had feelings for Yvonne, and had the antidote on hand for her, and suspected P of poising her.
Plus, who could she tell ? Even eklis, someone she thought could get her out of the game, who she trusted so much, fell under Y’s spell. Of course she finds it hard to trust someone again.
People in the mansion are vulnerable to Y, and she has no real friends outside.
The only one with potential is the crown prince, but again, she thinks he doesn’t fully like her due to the last time she checked the percentage, and might talk under Y’s spell.
Right now, only one she believes she can trust and help her is herself.