After getting spoiled for her whole life, suddenly reprimanding her will obviously not working.
MC will need some time to slowly fix her. Can be years.
And MC was very harsh, implying that Odile was not a great master, not worthy of the dedication of the servants, and a useless master who can't do anything.
After she gave up and distanced herself from Odile in the past.
At least based on Odile's reaction she can still understand that being evil is bad and don't want to be one.
She just didn't understand that what she did was evil.