Ok, I get the underlying message of class warfare. So I’ll address that in a second. I think where it loses its pizazz is a couple failed comedic attempts, subpar acting, and a flat out copy of the identical underworld “multiverse” “upside down” (D&D, Stranger Things). So, I guess if you can get past that, then it’s entertaining enough, though not actually scary. I predicted the ending less than half way through, knowing they were switched.
Anyway, the good news is, the theory that even though she was actually tethered, she had the benefit of subsequently living in the privileged world. In doing so, she formed family attachments and did what any mother would do for her family. That she is a tethered does not make the children any less hers because the tethered are human. They are subjugated alternate mirror people, not aliens or zombies. So, honestly, it was ok.
I suppose it begs the age old question, could the worst representatives of humanity have been different/better people if their circumstances were different?
My answer to this question is that the Lord is all powerful, all knowing, and all merciful. Whatever thought these kinds of concepts are meant to evoke, if we strived to live more like Jesus, we would never have to ask the question.