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After our last discussion, I'm inclined to think that this is more of a problem with the AI than with Kiina. If there weren't weeks of creatures, Kiina wouldn't have a problem with diplomacy, and it would also be possible to recruit creatures based on her specialization; you just need to balance the number.
By the way, the presence of diplomacy is definitely not a problem. Even if it's forbidden to use it, it's allowed to increase empathy.