It seems we are heading towards the revelation that Shiori doesn't actually want to eat Hinako or that she's trying to make her want to live for different reasons than those she initially offered.
Asuming the best of intentions on Shiori's part, her plan is to trick Hinako into being happy with life again and then fucking off to God knows where so she doesn't have to keep her "I'll eat you" part of the deal. But again, that's asuming the best and, even if Shiori's goal is to keep Hinako alive, I doubt she isn't looking for something else too.
Anyway, interesting talk between Shiori and Miko. It's nice to know Miko is aware of Hinako's death wish.