I think you are absolutely spot on, I also think she thought it would make her popular & give a group of friends. She doesn’t have a large circle & only feels safe out & drinking with her sister. She never does anything with her husband which strikes me as completely bizarre.
there's actually an entire post on her blog detailing the differences between early motherhood with erin - where she apparently had a whole group of close friends to spend time with, go for walks with and moan about her husband and how tired she was to - she was living the mummy dream and apparently "remembers her first maternity leave with such fondness". it was obvs everything she expected, and she felt loved and adored and supported.
she assumed it would be a similar experience with her second child, but when ethan was born, it was quite a contrast to her life as a mother to baby erin. not only was she utterly shocked and disappointed to have a baby
boy - and not the longed-for sister BFF for erin - she describes feeling nothing but lonely - which was only worsened when the golden child started pre-school. her baby "was her world, but also shut off her world", and she didn't make the life-long friends she expected to in baby groups, and found it difficult to bond with the other mothers in ethan's playgroup, as despite assuming they'd be "just like her", they were focused on conversations about weaning and motherhood, while she apparently just wanted to talk about the kardashians. hence why she started her blog, to distract herself from her loneliness and hatred of being forced to spend time with the baby and toddler she'd had simply because she assumed that having kids was simply the next step in the progression of her life as a woman.
it's interesting though how she clarifies that her maternity leave with erin was essentially a dream and filled with fond memories and close, supportive friends - yet by the time ethan was born a few years later, these friends seem to have disappeared from her life, as she's desperately scouting playgroups trying to form friendships. there's a definite contrast between her experience of early motherhood with erin compared to ethan though, and i can't help but feel that her low mood and loneliness and general struggles with motherhood were the result of gender disappointment and the resulting resentment she holds against ethan.