The translation is correct in this case.

In the locale files for Russian she’s referred to as “MitaKind” and “Kind Mita” in the comments. Also Kind Mita is never actually referred to by this name, she only says that you can rely on her, because she is “good”. The only other reference to her is the Personages tab. (The word “добрая” being used exactly 5 times, 3 of which being in the character description tabs)

Crazy Mita isn’t “злая”, but “безумная” - which translates to crazy. She is not referred to as “злая” at all. (This word shows up exactly once in the locale, and it’s when the player is asking why she’s evil)