First: there's a ton of 1 star reviews from terrible human beings who have no respect for women.
That being said, it was very contrived how 'busy' she was raising this kid. I'm much more sympathetic to single moms who are raising multiple kids, juggling multiple jobs, and struggling to pay bills, perhaps even in a third world circumstances. This character was instead raising one child. One. And she didn't have a job. And they lived in a nice suburban neighborhood with a nice house. Her issue is not about Maslow's basic needs, but about self actualization.
The biggest issue with the movie is that their two year old child, for some reason, requires attention 100% of the time. He sleeps in their bed, needs brain engaging activities all the time, needs to be involved in every conversation. This would have made more sense if the kid had special needs, but nope, fully functional child, that they just felt the need to spend 100% of their time with, including while they sleep.
It doesn't sound great but most parents will just let a kid cry it out sometimes. Most parents will allow their kid to feel lonely or bored sometimes. Most parents will probably use TVs or phones to distract their kids. Most parents will probably dump their kids off for a playdate, daycare, or with a grandparent. But apparently *zero* of these, that totally normal parents do, were an option for this privileged family.