So at this point, I'm not harboring much hope that we can resolve this diplomatically. She won't forgive us for killing the spiders we did, she won't trust people (least of all us), and I doubt we can convince her that another war between the spiders and surfacers will go well for her side.
Kilga, if you wanna take a stab at it, by all means, go for it. If a diplomatic solution to this is even possible, it's beyond me. The only thing I can see we can accomplish is to get her to have us left alone on our way back to the surface. Pretty sure none of us want to fight anymore spiders, especially as banged up as we are, and she has to know we'd kill them if they tried. And as much as I'd like to get more answers out of her about the history of her people, and this sword, I suspect we've reached the limit of what we can wring out of her.