ARE YOU FUCJING SERIOUS GO OUT FIND SOME HELP NOT FUCKING FLIRT WITH MEN SERIOUSLY!?!?!...

right! I totally forgot her so maybe she have forgotten her maid as well ¯(¯ࡇ¯)/¯

what you want her to do ?
she have no friend or ally, her step-mother control the house and she's a minor without authority.
i am not saying that what she doing is right but i don't see what she can do

She has the count on her side, who has authority and the evidence? The maid that was beat up.
They can end the shitters easily. I'm thinking okay maybe the family head position will just be thrown somewhere else and create more problems, however with the count giving them his word, they can't touch her anymore.
In fact the demon guy that is so conveniently there could at the very least threathen/frightened them
I swear there's so many ways to resolve this however Im more concern about her maid that might even die because she didn't ask for help

the count can't interfere with someone else house
A master beating maid is not something can shake the authority for an noble so the step-mother will stay in position (she can lie and say that he maid stole and fire her)
the MC is not a genuis, her way of thinking is not perfect

the stepmother won't kill the maid since she can be used as hostage

Honestly its better if the step mom stay in the position so that it's easier to get her revenge
If the count can't, she can always ask the princess and Prince for help I mean... She literally got kidnapped in their place, she can ask for a favour or 2, putting a dumb bitch in her place is very very easy for them.
In fact once she showed that she's close to the Prince and princess, she can always treathen them by saying she will go cry to them and ask them to deal with them

she can't be too close with the prince since her brother support the other prince ╮(￣▽￣)╭ , but i agree that the MC is naive