No one will ever be charged with the child’s death. Regardless of how she died, you and everyone else know her mother and grandparents know what happened.
Yes, the system works and that’s a good thing. But the fact that no one will be help accountable in this life for her death rankles.
I just hope this smirking, in your face sociopath becomes a pariah like OJ. It wouldn’t surprise me in the least to see her walk out of jail and flip the nation the bird.