I found this miraculous ladybug theory on Reddit
So does Alya trust Lila or not?
Discussion
Startrain kind of threw a wrench into what Alya’s outlook on Lila is. Don’t get me wrong, it was cool seeing Alya put Lila in her place, but from what we’ve seen of their interactions in Season 3, it makes no sense.
Alya DOES believe Lila’s lies. Even in ‘Ladybug’, which supposedly takes place after Startrain, we see Lila manipulating Alya when she’s doing detective work for Marinette, and Alya seemingly believes her again.
Maybe Alya is doubtful of Lila because she knows Marinette is, or because maybe Alya knows Lila likes Adrien (although I doubt it since Lila wouldn’t let anyone believe she likes Adrien). Perhaps Alya didn’t let Lila wake up Marinette for those reasons, but I still think it’s inconsistent based on what we’ve seen