My jr. high girls are going through purity class so, I went to the bookstore and looked for some related book and I found Pure by Rebecca St. James , a 90 day devotional. It's about purity of mind, body, and spirit. Even though it's written to help teenagers but, I found it very helpful & encouraging to any Christians, specially single women as Rebecca herself wrote from her own experience as a single woman.

Going through the process with the girls has been a growing process for me spiritually as well since I never had this kind of opportunity when I was a child. 

"Blessed are the pure in heart, for they shall see God."- Matt 5:8