If someone falls in a tub they would reach out to grab hold of something, therefore something would have been knocked over, the towel if there, would have been in the water.....not only that with a few bruises, she literally would have had to bounce around in the tub. Another point, when taking a bath, I don't know anyone that gets in an empty tub, sits down and then turns the water on. The water is filling or already filled when I person gets in. If she fell getting in, items would be knocked over and she wouldn't have had those bruises because the water would cushion some of that fall.
I hope the jury see's this like I do, I mean it is elementary my dear Watson.