Below are some resources, both books and on the web for discerning your vocation.
Vultum Dei Quaerere Apostolic Constitution on Women's Contemplative Life, Pope Francis
Sponsa Verbi, by Bl. Dom Marmion, OSB. Short book on the beauty and obligations of the contemplative life. (PDF file)
The Spirit of St. Dominic by Fr. Fabio Giardini, OP
To Heaven with Diana, the letters of Bl. Jordan of Saxony, successor of St. Dominic, to Bl. Diana d’Andalo, OP, one of the first nuns of the Order of Preachers
Saint Dominic: the Grace of the Word by Fr. Guy Bedouelle, OP
The Challenge of the Dominican Contemplative Vocation by Sr. Breda, OP