Angie was having fun in 16, at least those maids are treating her well.
Liselotte clearly has some manners to learn, but I don't fault her for that, it is clear with how nobles act here that she is growing up with her perception a little skewed, nothing really out of this world really, the same happens in real life with some growing too privileged, at least she is a good kid, curious too.
This whole situation has something happening behind the scenes, don't know what shitty little ploy they are trying to do, but it is pretty clear Angie is only there as some sort of "distraction", they better not drag her into their little scheme... but I don't say that because I am worried about her, she is the last person in danger there, she will carve a path of destruction if they try to screw her, I am worried for the property damage... that would be a hell of paperwork.