So Rinnee, here's what I was about to write for Xia's thoughts on Eve:

Eve (Friend) - Xia met Eve a many times as trainees. They hit if off fairly well, as Eve was serious about her training, which pleases Xia. She later discovered that Eve's own father was part of the Scouting Legion, who was also killed in action, much like Xia's own father. A certain understanding developed between the two, to the point that she would considerably call Eve a friend. Though Xia isn't very big on teamwork, if she had to partner up with someone, she'd want it to be with Eve.