She's sort of "old fashioned" compared to the others.

In the 1930s there was a return to a more genteel, ladylike appearance. Budding rounded busts and waistline curves were seen and hair became softer and prettier as hair perms improved. Foreheads which had been hidden by cloche hats were revealed and adorned with small plate shaped hats. Clothes were feminine, sweet and tidy by day with a return to real glamour at night. {From www.fashion-era.com}

or Cinderella

Just because that's where the setting takes place. XP Otherwise, I would pick Snow White.

Ohh definately.

because many countries around the world suffered through a depression at this time, and tiana makes me think of working hard but struggling to get by
either her or cinderella

Although she's from the 20s, this gal first came to mind. She has a spirit of determination which I think of when I think of the Depression.