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I like to see the situation with her maid not as a sexual thing from Jacinthe's end, but purely as a display of power(and because she thinks it's funny). Having Lebanne go around publicly in the maid outfit sends a message: "this is what happens if you cross me". She's like the rich mean queen bee but with a scarier amount of power. It's a bitchy oujo version of silly bets like "if you lose you have to walk around in your underwear" "if you lose you have to do everything I say for a day".
There is a sense of childishness about her that I think adds another flavor to her cruelty. She always got her way and never truly grew. She probably had maids as a little girl and made them do embarrassing things, and they had to comply since she's the little lady of the house. She doesn't see her actions as cruel, she sees herself as always in the right and anyone who crosses her deserves the worst. Unless she faces true struggle, she is forever doomed to arrested development. And possibly Marie Antoinette's fate if her dream of Jacinthe City becomes a reality.