...but swelling will occur and there was no swelling...
That's what I was thinking, but wait a minute. If she died after the head trauma is that not the same thing as dying of asphyxia with respect to swelling? Maybe her head didn't swell b/c the head trauma killed her. The take-away from the pathologists reports is that they don't know for sure what the sequence was, or which, if both, killed her.