It seems that many people are overlooking the fact that the Scully-Hicks' had already adopted - Shayla/Elsie had an adoptive sibling, that was already in the family. In the sentencing report there is no mention of ANY concerns for that child, and no reported injuries of him/her.
I imagine that her sibling was a very different child, maybe an "easier" child to parent hence why only Elsie was abused.
It's so desperately sad and tragic, and I imagine the doctor that missed the femoral fracture is distraught.
I expect we won't ever know why the maternal grandmother wasn't allowed to foster or adopt Shayla/Elsie. I would imagine there are issues there unreported, as IME Children's Services aim to make familial placements whenever possible as they are easier (and probably cheaper).
It's very easy to cast the blame entirely at the door of Children's Services - after all Shayla/Elsie had 2 episodes of bruising and a broken leg, why wasn't she removed? But seeing as Matthew had given apparently consistent reports of how the injuries occurred and the medical assessments tallied with that, (given the undiagnosed femoral fracture) and the evidence of the neighbours was never reported until after her death, what were they supposed to do?
Of course there were failings here and they contributed in small part to the tragic murder of a gorgeous little girl, but the only person ultimately responsible was her adoptive father.