While I can absolutely empathize with a woman who is struggling to find joy in motherhood while missing her professional life - this isn't sezzy, and i can't feel sorry for her.
Everything she does is driven by this bizarre need to portray herself as better than everyone else and/or make a martyr of herself. She doesn't need to sacrifice anything, she didn't leave the house for work before and did everything on her own schedule. Now she just has to do it with a baby strapped to her (because God-forbid she put him down and misses an opportunity for him to appear in an intastory rant). But no, she can't rely on others like her mom or something like daycare because she is a REAL MUM who wants to parent her kids herself (though I'd argue she does no actual parenting). She has the resources, but won't use them because her holier than thou/oh poor me mentality will not allow her. You can work FULL TIME and still be an amazing mom, she spends more time with her kids than most, but that time is all a performance.
Growing up, my mom worked full time as a nurse so, when I was really little, she would often be gone from the time I woke up to the time I fell asleep. Still, the time that I did get to spend with her is time that I still remember. We would plant tulips outside together, I would try to do her pilates tapes with her (which Sarah would NEVER let fox do, god forbid he lessen the calorie burn), we'd go for walks. Quality time with your kids, in my opinion, goes MILES further that whatever quantity of time you have with them. Kids are sensitive, they notice and feel a lot more than their vocabularies allow for them to articulate. They know when they are not being paid attention to, and it will often lead to them feeling like they are a burden or that the only way for them to get their parents to actually SEE them is to perform, whether this is by acting out or by trying to be perfect. I
It hurts, Sarah is hurting her kids because her need to be looked at a certain way by others takes priority over the needs of her children.