That adds to the theory that the church is feeding her drugs to scuff her power
They wouldn't want someone else to ursurp their light ability, and might just be keeping her as backup because the light element in of itself is rare
methinks it has to do with the drugs the church is giving her. she's probably the reincarnation of the last great light user or something that was prophesized so the church doesn't want her out of their hands or smth idk