This is a short article - the content on it is as much as is known from the Shades of London.

Erin was one of Rory's childhood friends from Bénouville, Louisiana. The two girls were Girl Scouts together approximately eight years ago. Erin went with Mrs. Fletcher, Rory, Jenny, Melissa, and the other Girl Scouts on their excuse to Mrs. Haverty's property. Rory was determined to find an excuse to enter the grand and mysterious Magnolia Hall, but Erin displayed little enthusiasm for the adventure. Instead, she kept her headphones on the entire trip and stared out the window without paying attention.

Erin presumably still lives in Bénouville.