@yurina she tried to explain few times but she is put under curse that makes it impossible. She feels dizzy every time and can't say anything. It seems that such simple plot is too difficult to comprehend for some readers.
Spoiler!
And she could explain whatever she wants and she still would end dead because only reason why Calix wasn't brainwashed was because she ran away and he was always away from saintess and was too obsessed about Laure for brainwashing to work when saintess went after him. Now she won't end because her daughter can counter brainwashing. If it wasn't for Latty even if she would explain everything Calix would be brainwashed and she would be burned.
She also tried to change things but Calix's parents still died despite her trying to prevent this. So stupid ones are naive people who think that just by talking all her problems would be resolved when she would end dead if she would just trust Calix.