Quote from CrankIn all fairness, in a physical sense, light isn't something you can condense, throw, and have it hurt someone like a rock. Might burn your eyes, sure but that's about it. As for the powers, lightening can start a fire, and both do create light. They aren't as different as water and earth, so I personally can see them going hand in hand.
Kinda want to fight this character at some point, too
I think the only thing she would be able to do is make fire and lightning look brighter. It's kind of like this, my character has the ability to control ink. So, by the logic that fire and lightning create light, that would mean I can control an octopus because it creates ink. That wouldn't make sense because controlling one portion of something doesn't mean I can control all of something. I could probably mess with the ink sack within the octopus, which would be the same as this character messing with the light that comes from fire and lightning.
Also, her light powers don't have to be physical attacks. She's already a big monster with a bunch of hideous and powerful add-ons. The light portion of this character could just add some utility.