In discussing "did she use Incite Emotion or Magic" it's very very easy to lose track of one thing.
In my opinion, what exact power is used should not matter. What matters is what is used in the story.
For example:
Breath Weapon is not Magic, normally.
However, I might very well have a Wizard that has so honed his Fire-evocation that he can send minor blasts of magic effortlessly. To represent this, I negotiate with my GM to purchase Breath Weapon, aim it with Discipline instead of Weapons and describe it as launching small fireballs.
Have I broken the first law if I kill someone with this? You betcha! Because in the story I used magic. If using the Lawbreaker power out of the book, we'd have to work out how it interacts with my Breath Weapon attacks, but the law has been broken no matter what.
In the same vein, I can definitely see a Sorcerer or such specializing in mind-magic picking up Incite Emotion in the same way, to mechanically handle a hyper-specialization in magic that Evocation doesn't do justice to.
In that case? Heck yeah Lawbreaker! Of course, I'd probably require the relevant Lawbreaker before buying Incite Emotion in such a case because that's a field of magic where you really can't become that good at it without breaking the Laws along the way.