A nice song for women to sing Acapella is 'Step by Step' I think Sweet Honey in The rock has a version of that.

Sarah, do you only sing in English or can you aslo sing in Irish? I ask because there are so many lovely songs in irish that would fit your range. Of course, your audience mightn't want to hear songs in Irish.

Are you striving to represent a particular period or outlook? Would religious songs be okay? I have always thought a woman with your range singing 'Soonah will be done' slowly and with sincerity makes for a great performance.