I absolutely agree with this lookout. To me this points to her having an episode. Only my opinion though just like I don’t believe she went to bed. Her bed hadn’t been slept in. Compared to June and Neville’s where they obviously go to bed.
If we look at the previous times she'd "
had an episode" she was either banging her fists against the wall or putting her wrist through glass. She wasn't killing four with 23 shots, none of which missed, then changing out of bloodied clothing, burning them in the Aga then changing into a nightdress to commit suicide, with or without silencer attached.