"Tomorrow were, a Blame"
You have to read it in connection with the rest:
Between Her final Room And Rooms where Those to be alive Tomorrow were,
Between the room where she would spend her last time in and the rooms, where the others (who will still be alive tomorrow) are.
"A Blame" probably means something like it is unfair that she won't be there tomorrow anymore too.
Uh, and also, read further... "A blame that others could exist [...]" so yeah, it seems unfair, but I think it also has some irony/sarcasm in it, since it is not anyhow melancholic, rather superficial and indifferent...which can be because of the value of the change in their perception, which seems more important than the death itself. Complementing the 'faith to regulate', as mentioned before...but yah, I'm babbling on here