Okay one spoiler that isn't really important, while Emily(the maid) is a bit hypocritical right here, there is later one genuine twist, after Penelope spared her, made sure she kept her job and didn't tell anyone about the needles, she rethought a lot about what she did and figured out that Penelope isn't the bad person she was and started feeling guilt for her actions.
She also became genuinely loyal and willing to do anything Penelope asks her to do just to hopefully make up just a tiny bit for what she did to her, she isn't being a snake, she literally is happy that Penelope survived and is alright, she's a rare person that actually likes her now and that just makes her feel bad about the past.
She is a steadfast ally of Penelope...even if Penelope doesn't realize this nor won't realize for a very long time, but already at this point, it's likely that the rest of the house could give her a lot of money in trade of her abusing Penelope again and she wouldn't do it, to be fair, it's not obvious at this point, but hypocrisy aside, one person in the mansion genuinely is happy that Penelope is alive and actually feels sorry for what happened with her nearly dying, which is more than other people at the mansion can say.