Interesting there's still no references to any reason why she turn back time

There will be but we still have a long way to go until that point, that is, if they decide to keep that part of the story in the manga.

Wasn't she already a transmigrator before she turned back time? Might be related to that. I do wonder if it has more explanation tho...

Tia's power to transmigrate comes from her mother's bloodline. If I'm not wrong she was from a tribe that had special powers each unique. She learns about her mother's history in the later chapters I forgot when but yeah that's all I can remember since I read the novel long ago. The parent's love story also has side stories I wonder if they'll cover it up.

That was a huge spoiler and you should mark it as such, in case people rather not know

I guess she was too busy keeping everyone alive in current timeline that she simply forgot to care about it xD

Cause she met Rick & Morty

there is, it's related to her mother, but it's still far