Corrupted Nun & Lucy

The nun's name is Lucy and she is a nun on a trip with a few other nuns protected by a small mercenary group. She is of elvish descent she thinks, though she never met your parents as she is a orphan. She was only able to get by thanks to the generousity of the church and as such she joined as a nun. She is currebtly 18 years old.

How was she corrupted and by how much?