I thought the same thing, but then I took out all the assumptions, and simply read what was printed, as it was printed. That often helps me change my perspective.
I don't really know what happened the last time. It could have been a caregiver that abused her, it could have been someone at a school program, it could have been someone within the family, someone that was on a registry, someone that wasn't. The abuse itself could have been anything from emotional, to physical, to sexual. The perps could have abused her during the same incident, or seperately or they each could have abused her once, within the same short span of time, and in each case, they were both charged, one for the abuse, one for standing by and doing nothing.
CPS is supposed to get involved in cases where a child is in need of protection. If they did a preliminary investigation and found that the abuser was no longer able to access her, that she was fed and clothed, not being beaten, and recieving adequate mental and physical health care, that is where their responsibility ends.
A much as I want to crucify the mother, I am waiting for something more. And I have no doubt that there will be more, info will keep trickling out. This is far from over, IMO.