Several people on this thread have suggested that there's no way JR would have staged JBR's body like a sex crime, as the father would be the natural suspect in such a case.
However, as I've discussed before, the evidence strongly suggests that the vaginal wound was inflicted BEFORE JBR actually died--possibly after the head blow, and before the strangulation.
So, if PR is the killer, and if this is the 'rage attack' so many assume it to be, then the following things happen:
PR causes the head wound, either violently striking JBR over the head with the flashlight, or slamming the little girl as hard as she can against some hard surface in the bathroom.
She then examines her apparently lifeless daughter and believes her to be dead.
Now, she carries JBR to the basement, removes her long johns and underwear, inflicts the wound, wipes up the blood, replaces the underwear with the size-12 pair, replaces the long johns, fashions the garrote, and then strangles JBR with it, not realizing she's actually killing JBR at that moment.
(Or, possibly, the business with the wound and the redressing comes before the removal of JBR to the basement; sequence is nearly impossible to determine.)
Fibers from JR's clothing are found on JBR's body, in the area that has been wiped up.
What does all of this mean? Does PR not see that JR will be a natural suspect in the death of JBR, particularly given the sexual wound? Does PR not further see that using JR's clothing to clean JBR will throw immediate and terrible suspicion on him? Moreover, what possible reason could there be to inflict a sex wound and then attempt to cover up that wound?
In my opinion, there are only three possible ways of accounting for all of this if either parent is involved at all:
One, PR did all of these things on purpose to throw suspicion on JR. Which then makes it very difficult to explain why JR would work so hard to keep her out of jail; he's a smart man, and would have many questions about how his shirt fibers ended up in such a sensitive area of JBR's body.
Two, PR did all of these things on purpose to hide evidence of sexual abuse being committed by someone other than JR. This would explain her willingness to inflict a sexual wound, clean it up to further 'muddy' evidence, and even to be careless about JR's clothing fibers. Unfortunately, this requires a level of self-possession and cunning on the part of someone who has just accidentally killed her own daughter that is hard to accept as reality; it also requires a level of altruism, because even a lecherous family member would be a better suspect than PR herself, right?
Three, JR inflicted the sexual wound, but then hid it, because in this instance the wound is not intended to make JBR's death look like a sex crime, but only to compromise evidence of prior sexual abuse and to create confusion about whether such abuse even happened. IF that was ever his intent, you must admit that it succeeded admirably.
So, there might be a motive for a father to inflict a sexual wound on a child--if he had been abusing her prior to her death.
But because of the timing--wound inflicted before death occurred--whoever inflicted that wound MUST be the person who killed JBR.
To me, that wound is the single most important feature of the case. Create a plausible scenario that would have PR inflicting that wound before she even 'finishes the job' so to speak, and you will convince me that she's the killer.
Otherwise, all the speculation about PR being tired, drinking, taking medication, being up too late, being frustrated with the bedwetting, planning to give a recalcitrant child a dye job at midnight, or even douching a six-year-old, interesting though these speculations might be, do not and can not explain the urgent need to inflict a penetrating wound to the vagina of a child who is not yet dead (even if the killer believes she is)--and then take measures fairly quickly before or after the strangulation to clean up the evidence of this wound!!
