Uhhh.... This girl (she was a lone wolf in the game) time travels (? I don't remember her dying) back in the past. Now she can make things right. Like her cousin not dying, being a good friend, also be a badass, and yeah... I think there was romance (though subplot) with this guy from the West name... Time something. Timeless? (Maybe, maybe not) any ideas?
Ofc she is a lone wolf, what other roles are there to these kinds of novels. Harem or lone wolf, since she's not male that leaves only one, since readers wouldn't read a reverse harem.