She didn't enjoy motherhood, that's clear. Looks like she enjoys a very busy academic and social life and frankly for some people that's too much to give up.
But I think what she might mean is that stuff related to motherhood is oppressive. For example you have to stay in and put your child first. You take a pay cut or give up work. Your network of friends decreases. You are not 'free' anymore.
It's just that some of us are willing to exchange that for the joy of bringing up our kids whilst others feel it's too much to ask.
It is a personal choice, luckily we have the contraceptive pill so we can make that choice.