Regarding Hannag, does she factor in later on? (spoilers)

[Vicious Pastry]

So I learned Hannag created the Deathfog that was used in one of Lucian's Wars (maining Ifan). I confronted her about it and she was putting the blame of her genocide smoke on Lucian, then said if she could do it all again, she would not.

I'm torn between killing her or not, on the one hand she regrets her actions, and I've been playing the game on a redemption kind of morality, dependant on the severity of the sin. On the other hand, I remember when I tried getting Source from her, and she was almost eager at the thought of the death of the forest creatures around her.

When characters lie in this game, it is usually pretty obvious. We don't get Witcher levels of deception, but the game does keep you suspicious of certain characters.

I mainly want to know if she plays a bigger role in the story later on, or if she has outlived her usefullness and she may even prove more of a dangerous factor at some point relating to Lohan's schemes.

And I know I marked this for spoilers, but I don't want specifics, only a yes or a no.

[ChckChckBoom SAIYAJIN]

Hannag is the wizard lizard lady right? If so then no, don't remember any talk of her in Arx.

[Hearshot]

attack her and see what happens.....I think she is likely a villain

[Vicious Pastry]

Update: I killed her am in Act 4 now, and still don't feel a shred of regret. She and the Dwarf in the cave who was making that "purifier" thing were responsible for the Deathfog used on the elves, and they were planning on using it again.
My companions think I'm an impulsivly violent savage, but I've only killed like, 3 people, unprovoked.