After finishing chapter one, I'm kind of shocked people aren't more sympathetic to the mom
Honestly, she's 22, which is quite young, and being criticised for wanting to attend a party or staying out late for one night, and are then shocked this leads to resentment? It seems far stranger to me to expect someone to give up their entire life upon giving birth. Its perfectly normal for parents of young children to go out and have their parents or babysitter watch a child even today. In period this child would be mostly raised by the nursemaid and that would be the expected norm for the aristocracy. The mother would be absolutely not expected to do more than manage the nursemaid and other household staff and check in. Both in the modern world and historically, this attitude is strange and it really seems apallingly obvious it would lead to resentment to tell her her life is now functionally over.
I will keep reading but I deeply hope this doesn't resolve itself by the mom throwing herself into only parenting and never attending a ball again. I think its really unreasonable to have this attitude that mothers should do nothing but care for their children. Of course, parents should care for their children but its perfectly normal to maintain a job or hobby or have an occaisional night out.