Responses
I think the whole duke's family has a condition not to care maybe? or they think the whole family is strong or something, so they probably did not expect that, like look the whole family including the servants did not know what MC is really like, they all assumed she's cold and elegant
They recognize lulu from when she used to be abused everyday in the marquis household but throw that out cause no way she was abused right? Still even if it wasn't lulu they didn't do anything but now that she is out of it they are all dotting after bcs it benefits them. THEY SHOULD SUFFER AS WELL ALSO THE DUKE SHOUDVE SENT SOMEONE TO MAKE SURE LULU WASN'T BEING NEGLECTED IN THE MARQUIS HOUSEHOLD INSTEAD OF TAKING THER WORD THAT SHE WAS OK.