Institute of the Blessed Virgin Mary - the formal title for the Sisters of Loreto.

The Virgin of Guadalupe is a title of the Blessed Virgin Mary and tradition holds that she was an only child.

Yes. It is one of the titles associated with Mary, so it does get capitalized as Blessed Virgin.

Mary Janice Ziolkowski has written:

'The Felician Sisters of Livonia, Michigan' -- subject(s): Felician Sisters, Felician Sisters. Presentation of the Blessed Virgin Mary Province, History

Society of the Sisters of Saint Ursula of the Blessed Virgin was created in 1606.