Somehow, she felt it. With Heine's maniacal look, combined with Duke Miller's apprehensive, but cooperative attitude.
Estelle was somehow able to piece it out although not in a detailed way.
Everything must have something to do with her soul and Heine's 'sister'.
Estelle felt her own self be in danger. At an existential level.
She was afraid that she would be seeing the Ruler not as the Estelle the being knew her of, but as a true Value 0.
Danger was approaching, but as her soul count depleted, she was slowly collapsing from within.
Her consciousness was about to fade as she felt dizzy all over. Just like always, she fell.
After she had fallen unconscious, she entered a state of mirage, where she was trapped in a white space.
Just from a glance, Estelle could tell that the place wasn't Eterna. During the one month stay she had in Eterna, she knew the little perks of the realm and wouldn't mistake such a unique place for another.