Yuma

The character doesn't have to die for it to be considered an isekai. It just has to be a transfer between worlds, whether it be by death, summoning, portal, or any other way.

She didn't "awaken". Just because we haven't seen her mangekyo yet doesn't mean she just got it. They implied that he knew she had it but wasn't using it, which is understandable since remember, these abilities damage their eyes. She is a late teen, not a good time to be sacrificing longevity. Anyway, she probably got this Mangekyo soon after the village/Kawaki betrayed Boruto. If not then, then it was possibly after finding out Sasuke was sealed.