It feels kinda cheap that she decided to go against Sylas after using a Petricite Potion for plot reasons (i.e. so she can maintain plausible deniability on being a mage). I kinda want Garen to just flat out say to her face that he knows Lux is a mage in the final volume of the comic, since her powers are more-or-less the worst kept secret in Demacia. Or for Sylas to just blow the whistle on her since she "picked her side".
But I suspect Riot won't do that because "we have to keep things our way!", which will more-or-less be shooting themselves in the foot by not letting Lux live without hiding.
My 2 cents.