Defense's closing implied that Michele never had pants on and was leaning over the tub trying to wet her hair under the faucet when she "fell" in. IMO that makes no sense. If you were doing that you wouldn't take your pants off. You might take your shirt off to keep it from getting wet, but you wouldn't leave shirt on and take pants off.
Also, Spence implied that Ada's description of finding Michele in the tub "trying to wet her hair" was consistent with MM's statement that she was "face down". But what I recall from little kids who bath and wash their hair in the tub, they generally lean back and dunk their head backwards leaving their face out of the water, so that would be how Ada would naturally describe her mom if Michele was face up, not down.