girls prayer group

A few friends and I are planning on starting a prayer group-- not so much a bible study, where we delve into small sections of scripture because we are already involved in bible studies. But, an actual prayer group where we discuss problems we are facing, encourage eachother, and take it to the Lord....

We mentioned possibly reading books, not so much a bible study but reading a book one month then just meeting a discussing it and application, no real plan, etc.

Anyone have ideas of good books?