Anna Kournikova? Rachel Ray? Someone else? http://www.usatoday.com/story/news/...10-bill-alexander-hamilton-jack-lew/28882687/ In all seriousness (the living aren't allowed), the Harriet Tubman idea is pretty good. Sacagawea or Rosa Parks would also be good. Though, if they're going Civil Rights era, it's hard to justify Parks over MLK on currency. I dislike the Eleanor Roosevelt idea.
Why just 1 woman? Let's have Oprah, Caitlyn, and Michelle all sitting around a table playing cards and smoking cigars.
I like Roosevelt, the greatest First Lady in American history. However, if we are going the civil rights route, there are better female candidates than Rosa Parks. To me, the most important female in that movement was Diane Nash. Otherwise, an Elizabeth Cady Stanton or Frances Perkins would be good, as well, Perkins, in particular.