It's not idiotic to want to help someone, but yeah, it was weird that she didn't feel anything was off as she was lead there. It feels of danger tbh. But the maid said she was taking her to a servant, so maybe she assumed they just live in bad conditions? She said this world is in bad conditions compared to hers. At least she was observant and calculative when faced with the dog.
NO. It's the fact that she gave CPR in a patient that who was injured by a blade.
Were they talking about that? OP mentions "idiotic" and "Mary Sue behavior", which makes me think they're referring to the latest chapter where the maid tells her to follow her to a sick patient and she follows the maid into a shady area and gets locked in.
It's truly idiotic to follow someone you don't know enough and the fuck girl has no survival instinct. She can't even sense what's wrong and has become too complacent
Shes quite idiotic, that mary sue behaviour is boring, hope she can grow a bone... Or not, she will use that to seduce the ml