I think old Patsy was cleverer than we have been giving her credit for.
She tends to divert the interviewer by introducing a lot of insignificant items and details into the 'mix' - I suspect in an attempt to generally muddy the waters of the investigation.
Things that she saw in photos - things that she knew FULL WELL about (and had even purchased them herself) she suddenly developed amnesia about "I can't imagine how that got there" "I don't recall seeing that before" - even ordinary domestic items.
The heart on JBR's hand (which she would have known was drawn by either herself or JBR - PR denied all knowledge of seeing before. The pineapple, the glass of tea, the tape, the duct tape, the baseball ball, the flashlight. Then, for added confusion, throwing other trivialities into the mix, i.e.....(paraphrasing) "I may have been dying my hair on Christmas afternoon" Yeah, right.
Plus having selective amnesia., which seemed to affect the whole family.