Do you seriously not see the reason why she was dismissed?
Do you honestly think the maid would happily join MC despite how hostile she has been?
she literally said she's got nothing against the mc, but the other girl. so yes, if it's just the mc, then there's nothing stopping her. especially if they order her for "rehabilitation" or whatever. maybe to learn the hardships of the girl she's been dissing or whatever excuse they come up with to make it happen.
also NO, of fucking course did i not see a reason for her to be dismissed since most manga gloss over assaults or even attempted rape with a fucking apology or a slap on the wrist lmfao
so seeing tangible/logical consequences for one's actions in a manga of all things was a genuine shock. and all manga shenanigans aside, i would have expected she gets called to the lord and yelled at and warned. and only dismissed if she does it again.