Serena knew the whole time about Luke turning time back ??? since when ??? lore drop ???

Erinda told them what happened to her, what I'm confused about is why Reynolds seemed confused.

ik erinda told them that she's lived the same life 3 times, i just seem to remember that Luke told erinda only that he was the one that turned back time

Maybe Serena has something to do with Luke rewinding the time the first time, since he said 'it’s not his secret to tell'. So Serena probably knew Luke was the one who turned back time for Aerinda