The best I can say from what the evidence tells me is that the wound could only have occurred in one of two ways: Either someone swung at her with an object that could drive a massive rectangular piece of skull into the child's brain, or her head hit a stationary object with sufficient force to cause that injury.
In other words, I think it's just as possible someone struck her as it is that her head violently smashed against something while she was being strangled. I don't think the two fatal events necessarily occurred separately at different times. I don't think we have enough facts to know either way.
The physics involved in calculataing the force of the blow would include leverage, mass, speed, distance from the child if the injury was from a blow, and the size and strength of the person who struck the blow. We just don't have enough information about those particulars to draw any conclusions about how the head wound occurred.
I'm trying to think of a word that my CRS isn't registering right now - the movement of the brain in shaken baby syndrome - there is a specific term for it.
Here is a tiny bit about what didn't show up as far as being thrown against a stationary object or being hit from behind, for instance, while face down on the carpeted area. AAggh, it's like "bounce," only technical.
Anyway there wasn't much of it, only a little side-to-side:
" ... At the tip of the right temporal lobe is a one-quarter by one-quarter inch similar appearing purple contusion. Only very minimal contusion is present at the tip of the left temporal lobe. This area of contusion measures only one-half inch in maximum dimension ..."
Darn it, it's right on the tip of my tongue. (Sorry I said that, JBR.)