It may not necessarily preclude a prior bedwetting. And it doesn't preclude bed (or clothing) soiling. Urine is constantly being produced by healthy kidneys. There is always some urine to be voided if some time has passed since last voiding, even as little as 20 minutes. But for JB's longjohns and panties, as well as some urine being found on a basement carpet indicate there was significant urine voided at death (or as she was dying). There was no feces voided because it had not progressed far enough along the lower digestive tract, and was seen at autopsy as "soft green fecal material". So even with the relaxing of the sphincter muscles at death, no feces was eliminated at death.
I do not feel the two ponytails hairdo had anything to do with the crime, staging, or anything else. I know I am probably in the minority on this issue. Here's why I feel that way: JB often wore her hair with a topknot ponytail, where a small ponytail is pulled up on the crown and the rest of her hair is loose around her shoulders. She can be seen in this pretty hairdo in a photo taken at the R party on the 23rd. My own daughter often wore her hair like that when she was little. Then- at bedtime, Patsy said she used to make a loose ponytail so her hair wouldn't tangle from sleeping. So I can see Patsy readying JB's hair for bed by simply leaving the top ponytail in place and pulling the rest of her hair back into a loose ponytail (at the nape of her neck) as she usually did for bedtime. This wasn't something done, IMO, to prepare her for bashing, staging, or anything else. It was simply the way she was going to bed that night.
I don't feel the turtleneck was worn for any "performance" that night. The red turtleneck may be a red herring. I know she didn't wear it to the White's, because there are photos of her wearing the white shirt. But she MAY have been changed into it after they got home. If that happened, I can't really see a good reason for it. It was found soaking in a sink. So something happened to it, or it would have been washed along with regular laundry. It isn't the kind of garment that needed hand washing, I can't fit that piece into the puzzle.