I remember when I had first heard about this case, I was at a UCSB summer program in the summer between 8th and 9th grade, and the racial history class we had played a YouTube video which had a sad song played as a slideshow of Emmett, including his mutilated face played.
I'm black, so I had a black history encyclopedia growing up, and had already read about lynchings and other brutalities on my own accord many times, but I hadn't experienced a story that up close and personal, I almost cried and the music and image stayed with me for awhile.
Reading the Variety article, the description of her "tender sorrow" irritated me, but ultimately this changes nothing as to my opinion on "justice".
I believe the purpose of prison should be rehabilitation or humane containment if someone's too dangerous to be let into society, and charging her would achieve neither of those things, it would only be a symbolic arrest (and my opinion on this also extends to the absurd notion that she or anyone in existence should burn for eternity) which really isn't needed in my opinion, not shaming anyone who feels like that though.
Hopefully she recognizes the weight of her actions and raised her children to be better than she was, though as someone with no particularly strong familial relations, it's hard for me to imagine standing by someone who did something like this even if they were my parents.