I understand why Hinako feels so hurt due to this reveal and yeah, she definitely need therapy to take care of her feeling (when think about this, why none of the story ever using therapy? even in the The Summer You Were There, Shizuku's parents never sent her to therapy but just bought her a dog?). but if you think with clear head, Hinako should be glad that Shiori gave her blood and survived the accident. because living is much better than died, and I'm sure her parents also wants her to keep living instead following them to afterlife. I'm sure eventually Hinako will accept this after sorting her feeling tho......also as bonus point, Shiori keep protecting Hinako too.