Much of Nike's life had been being out of the loop and then suddenly crammed into it with her siblings and being forced to make things right for Zeus. So she tended to know things a lot of other people either never would, or wished they hadn't. As much as she didn't want to know some of the things she knew, she had gotten used to it over the years. She dealt with it and moved on. And that contributed to her being the way she was. Get a job done, don't ask questions, bring the suspect unconscious to Zeus... or the Erinyes, depending on the crimes.
Nike felt very out of the loop right now with whatever was happening with Theseus. She did feel a twinge of frustration that he wouldn't tell her, but at the same time she got it. She understood that sometimes you just couldn't say anything. That saying something to someone not involved could ruin the integrity of the mission. However, her gut told her it had to do with Poseidon.
Nike searched his face, feeling rather helpless. She hated that feeling. Usually she could do something, or at least go to Zeus and reason with him. He was an understanding guy. Surely he could be of help! She frowned, hating all of this, whatever it was. "I can tell. You can't tell me anything?"