To be fair, Star Spangled was a bit concerned since he had no idea what kind of superpower the Secretary had. Although he briefly heard how proficient she was when it came to missions like this— well, he only came to know about all these when the Eye Goddess talked to him.
Seeing is believing. And since Star Spangled had never seen the Secretary in combat, he had no idea whether she'd be useful or not. He did get the Eye Goddess's reassurance... but that was one thing and this actual mission was another.
"Is everything all right?" The Secretary asked, wondering why the Star Spangled was wearing such an anxious expression on his face. Her mind told her that it was because of her presence... but she was well aware that Star Spangled wasn't that shallow so she flung the thought out the window while shaking her head.