It is logical, the goal was to suggest she shot June and then killed herself.
The delusions you speak of were when she was not medicated and/or on narcotics at the time of said delusions. She was medicated and not under the influence of narcotcs so there is nothing to fear especially since she would be dead in a minute.
It is not logical at all. It is very illogical that Jeremy would choose to "drag" Sheila into the bloodfilled room with her heavily bloodstained, dead mother. It would upset her immensely - a very stupid move of Jeremy in fact. All that for some flimsy, unclear "staging".
I find this to be a problem for the nons, which has never been addressed properly. Not to my satisfaction anyway.
You are dismissing that Sheila was gravely mentally ill. She attacked the Meter Man who got very scared of her. She was not in a stable, calm state during this period as you try to make it seem.
You have to twist and bend a little here and a little there to make things fit. That is a fact.
P.S. I don´t mention her running screaming from the monastary the previous day. I am not sure where that rumour comes from. Perhaps it is more than a rumour, I just don´t know where it stems from. Anybody?