doesnt ysnay exist through concepts or information? i roughly remember something like that.
as long as there are records of her existence in the universe, she will continue to exist in some form.
It's better tbh. In a way she lived on as a clean slate. It would be conflicting if she herself survived but now her daughter who is her but not will be his lover instead with how she's engraved her abilities and feelings for Claus on her. It's a suitable end.