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She wears pink, but I'm pretty sure the "teaching you about sneaking" part is correct. Although I think a number of kunoichi/sneaking games do that.
Trivia: If you take the (slightly mixed) characters for ku, no, and ichi in Japanese and overstrike them, you get the character for "woman." In other words, く ノ 一 = 女
I dunno if that's where the word came from or not, but, hey, free knowledge.