I deeply dislike Tessia

It may be a product of my own missunderstanding but I feel like she has an overall negative effect on the plot. Not negative in the sense that the story is bad, but in the sense that she is a fault for major loses.

Okay I think I genuinely can't explain it well enough, but I sometimes feel like she is either supremely shortsighted or selfish. It is not something I would hate in an actual person, but in a character it is easy to hate.