Marty by Elisa Bialk (1953)

Marty felt sick as she faced her city editor. "I'll know better next time," she promised.

"There won't be a next time." The editor's cold blue eyes swept Marty's face. "You're fired. I told you being young wasn't going to excuse you when I hired you. I gave you a chance and you've muffed it. I just can't keep you on as a reporter."

Marty, her face burning, turned away from the desk. There was a such thing as pride ... (from the back cover)