I don't know whether it got brought up already, but Mari tried to sacrifice herself for us, and would have succeeded had Kei not used her bloodline to throw a wrench into Mari's plan at literally the last second. Informing Hana of this might help.
Or she might conveniently rationalise it away. Either or. But it probably won't hurt.
Or she might conveniently rationalise it away. Either or. But it probably won't hurt.