She could, but I understand why it’s really not an appealing option at all.
Up with the kids, getting them ready, school run, back home, yes some time to yourself then, back out for kids, sorting homework, uniforms, dinner, baths, packed lunches for tomorrow, kids sorted, off to work for Mum.
No time with her husband and no time with the kids at weekends.
Sure, if it’s the alternative to a house being repossessed, or a six month arrangement to pay off debts, go for it. Otherwise, that’s just misery, isn’t it?
However, there is a broader point to this. Some of the posts on here indicate it’s next to impossible to work if you have children, but of course that isn’t true. What is true is that it’s two jobs - caring and providing. If you are at work, you need to pay someone else to do the care, and if it’s a low paid job, then that isn’t worth your while. So some couples decide that one will do all the caring (nearly always the woman) and the other will do all the providing (usually the man.)
It’s depressing and sad it’s still the case in 2020.