She just reminded me of Head!Shrink with behavior that doesn't seem appropriate in the moment.
I felt the exact same way. Particularly as I definitely felt like Trish being the body in the morgue was unlikely, I wondered how much of that entire scene was Kev's grief and delirium rising to the surface.
The tightrope walk of Kev's psychological status in these final episodes is *destroying* me. SO MUCH MORE on this to come in finale comments... but undeniably, Jamie is doing some incredible work with this aspect of the plot.