Those who think that Sheila couldn't have been dead long because blood was running from her neck would have to explain how she was still breathing with blood in her mouth and throat? With no sign of any expirated blood on her face and the surrounding area? While the long since dried cracked blood which had ran from her mouth - shows she had been dead for some time.
It's not possible to breath with a throat full of coagulated blood - if you're not breathing, your heart isn't pumping which makes it impossible for blood to flow from a wound on top of the body, it defies gravity!