Probably like here daughter was already too damaged to function well in the outside world (it’s the other kids staying that tells more).
That’s a huge assumption. Maybe she just liked it. Some of these women obviously do. I certainly wouldn’t, but some of them seem quite content.
In the 1900’s, about 3 percent of the Mormons in Utah practiced polygamy. It was almost always practiced by the men who had sufficient means to support a bunch of women.
Anyway, some of the women liked having “sister wives.” For some of them, it freed them up to pursue careers, while still having children. Some women were sent off to schools. I remember reading about one who went back East medical school, while her “sister wives” cared for her children. In an odd sort of way (and certainly not one I would ever want to emulate) some of the women in polygamous marriages were liberated in ways that other women of the day were not. Utah was, I think, the first state to give women the vote.
On the other hand, there were women ended up feeling sad about the arrangement, and suffered the kind of jealousy and unhappiness that most of us would imagine we would feel in those circumstances.