What’s up with Karris?

I’m 10 chapters into The Blinding Knife (please don’t spoil beyond that) and I have a question about Karris. She figured out the big secret at the end of the first book, and from her point of view, this should be crazy.

Dazen killed 95% of her family, left her literally homeless, and ran away. Now she finds out he took the place of her betrothed, broke their betrothal, indirectly brought about her father’s suicide, and ruined her life for a SECOND time.

And he has been masquerading as the Prism himself for 16 years, a terrible terrible crime.

Now from what I’ve read so far, despite Gavin doing what he did “that night” she was looking forward to marrying him. She was pretty close to both brothers as a teenager and over the last 16 years, has even forgiven “Gavin” for what he did to her as a youth.

But now she realises both times her life went upside down, Gavin had nothing to do with it. It was Dazen both times. She should be furious. But instead she doesnt even bring it up, and actually asks Ironhead to send her with him on his journey? Wouldn’t she want to expose him or stay far away from him after all he’s done? She’s angry at him but it seems more like she’s angry because he kept her in the dark and not because he wiped out the White Oaks?

Is there more to their past that will be revealed as I read or is her character just weirdly written?