If you look at Patsy's behavior before JonBenet was "found", that would explain if she was in any psychological state of mind, e.g. psychosis, neurosis.
Patsy cried most of the time. She was hysterical. She cried out for her daughter. She wanted to trade places with JonBenet. She even tried to comfort herself when she told LE that LHP could be the culprit but would never "harm" JonBenet. Patsy even managed to go up to the second floor and look through JonBenet's portfolio for a recent picture of her.
Her behavior:
Distraught mother - normal behavior.
Trade spaces - normal behavior.
Positive JonBenet would be safe with LHP - that's up in the air.
Helpful - Personally went upstairs to fetch a pic of JB for the Police.
This sounds like a Mother who is displaying normal behavior under the circumstances. Personally, I do not see any acute psychosis, acute neurosis, nothing that sticks out.
So if Patsy were in a, lets say, acute psychotic state when she killed JonBenet, than she would have still displayed those symptoms when Officer French appeared at her front door.
My belief is that JonBenet was struck by an enraged Patsy. A hair-trigger reaction to rage....pick up the thing closest to you and hit your target.
Toltec, do you agree or disagree or have no opinion on the various claims that Patsy was bipolar?