Our heroine got fired when she slapped the boss' face for
pinching her arm suggestively.
"Hetty mounted with her rib beef to her $3.50 third-floor back. One
hot, savory beef-stew for supper, a night's good sleep, and she would
be fit in the morning to apply again for the tasks of Hercules, Joan
of Arc, Una, Job, and Little-Red-Riding-Hood."

Who can tell us who "Una" was ?