I just don't think that jail time is the answer in this case. Accidents happen. I don't think she set out to have one of her kids drown.
I tend to agree.
Context and facts are everything. And I don't know all the facts.
But, I suspect there was no ill intent or maliciousness involved. It sounds like sheer stupidity and incompetence. If true, this woman is going to suffer and pay for this the rest of her life emotionally, psychologically, perhaps even physically.
If she has other kids, they should be take away, while she undergoes court-ordred counseling and parenting skills classes.