I'm really sad that she killed herself over a misunderstanding and has to be reincarnated ...

I can't imagine how the father felt after she died. He probably blamed himself a lot for being too tsundere and not even consoling her before leaving her alone that day. And maybe, this is just a theory, the father was the one who turned back time? Floyens have powers, right? It's either her or her dad that caused the reset. (≧∀≦)

Spoiler
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Regis loses his mind after Juvel's death. He falls into despair and goes berserk and kills the emperor.