I don't get the competitive nature of that new bro's maid, like i guess you can be from the main powerhouse's shade but also you are openly and accidentally opposing the above far beyond your main powerhouse's and still would beg to the little kid to somehow overturn the far beyond's decision to favor your side of the shade, like where is the shame in doing that.
There is no redemption arc for that new maid, she just showed up, completely oblivious to her surrounding (in which also is the other's fault), while also showing favoritism towards the new bro while all the mess is caused by herself, in another's mansion she never been to (maybe).
I don't know if she is one of the house's or the other's maid, but that obliviousness to her own fault is kinda annoying for a reveal to me, i've seen this type of character a lot of the time and mostly they got absolutely no kind of repercussion to their action and just keep their character flaw (yes, this is a character flaw, not a character quirk) and most of it is coming right from this kind of environment (kind mc, kind world, no hate from losing party).
While all this is going, she really jump from trying to be formal to unformal real fast like there is no hint of respect to other, that kind of thing also enforced my opinion on her badly, like i guess yes you can make a character to be this way but also think about the TPO (time, place, occasion) to make her not come up as rude or oblivious (if maybe this is a setup for her, but that is very unlikely).