This happens to 20 parents a year roughly out of all the parents in the country. It's not exactly like this is a "it could happen to anyone" thing. Clearly this happens to an insanely small percentage of parents out there.
As I said before, in this case it's pretty clear the mother didn't have any kind of ill-intent, but that doesn't mean that she should be able to walk away from this without any ramifications. Should she be allowed to have more kids in the future? Surely she wouldn't make the same mistake twice, right? Is she mentally fit to continue teaching other kids?
Obviously the mother is punishing herself, but that doesn't change the fact that a kid is now dead and it's her fault entirely. It's "her brain" that failed.
Locking her up isn't the answer, but declaring that she can't have kids anymore and can't teach anymore or something doesn't seem too crazy to me.
I get it, I'm a monster...blah blah. Just because the accidental death of her kid is tragic doesn't mean we just leave the mother alone and let her deal with it herself. She clearly had mental problems before, and surely it's worse now. She's not guilty of a crime, but she should need to go through mental therapy to determine if there are deeper problems at play.
Sorry that that opinion offends you.