Next chapter we should finally learn why heronia was, albeit drug-addled, misinformed and entirely blind to reality (or maybe it was just escapism out of sheer despair?), a heroine true to her name.
This part is somewhat more of a spoiler.
Take note that she picked only the yellow dress, persisting only on the prince's route (and has established only caring about it and giving up on all the other targets many chapters ago, back when she realized reality was skewed)