There are 3 books in the The Gemma Doyle Trilogy series. The newest book is The Sweet Far Thing which came out in 2007.

1
A Great and Terrible Beauty

Book cover of A Great and Terrible Beauty
It's 1895, and after the death of her mother, 16-year-old Gemma Doyle is shipped off from the life she knows in India to Spence, a proper boarding school in England. Lonely, guilt-ridden, and prone to visions of the future that have an uncomfortable habit of coming true, Gemma's reception there…
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2
Rebel Angels

Rebel Angels
In this thrilling sequel, Gemma continues to pursue her destiny to bind the magic of the Realms and restore it to the Order. Gemma and her friends from Spence use magical power to transport themselves on visits from their corseted world of Victorian London (at the height of the Christmas…

3
The Sweet Far Thing

Book cover of The Sweet Far Thing
It has been a year of change since Gemma Doyle arrived at the foreboding Spence Academy. Having bound the wild, dark magic of the realms to her, Gemma has forged unlikely and unsuspected new alliances both with the headstrong Felicity and timid Ann, Kartik, the exotic young man whose companionship…