She Kills Monsters by Qui Nyugen, but may not be appropriate for your audience
Different sorts of quests that have female leads and other female parts but are small casts:
A Piece of My Heart by Shirley Lauro (nurses in Vietnam)
These Shining Lives by Melanie Marnich (women who painted radium on watches)
Dead Man's Cell Phone by Sarah Ruhl
Sense and Sensibility by Kate Hamill
Saint Joan by George Bernard Shaw
The Intelligent Design of Jenny Chow by Rolin Jones (rather quest-like, but may be inappropriate)