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Quick question. How powerful are her swords? It's not defined really in your character sheet [@Feisty-Pants] just that you could probably harden them past normal swords. That's neat and all but Devil's shields can stop most mortal ammunition. I say most because other than a small explosion would break through. I don't see swords, however hardened, piercing them. So before I finish up this post, I was just looking to get some clarification. 
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It's not just hardness that you should be worried about. It's raw, hardened light, which means it's compressed to a degree far greater than a laser or something relatively similar, putting it under an immense degree of pressure.

What happens when something under massive pressure is abruptly fractured?

Explosions. White, blinding, fiery explosions. Probably equivalent to a mortar or a hand grenade. 

That is if she chooses to. Which is only rare, since it would cause extensive collateral damage. She's self limiting by that degree.