Well, but you make characters(at least on the "good guys' side") likable. And if they end up frustrated over her actions is not a good thing. You know many people watchs anime for fun and they don't start analysing the characters. That's why I think they should've made her more understandable. Not to mention many times her actions were controlled by her emotions in contrast with her Light Novel counterpart.
In short: They messed up her the most in the anime.
(well, the second one's Layfon then)
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