Peggy wasn't an idiot. Indeed, she was quite the opposite - you didn't get as far as she had into the army by being an airhead (with maybe the exception of Private Lorraine). She was smart and could think quick on her feet and certainly wasn't the type to dither about.
But love made ditherer's of even the most level headed people. Or at least that was her excuse to her herself. She would love to use it on her superiors, but she didn't think it had much chance of working.
Shame.
So she was now a ditherer. But she wouldn't give up on Steve for a little thing like that.