Hear the One About the Keeper’s Daughter?

St. Mary’s County Library’s web site (click here)       is advertising an upcoming event titled the Keeper’s Daughter.  It is described as an alternate reality game that explores the history of Point Lookout Lighthouse and involves solving the mystery of why the daughter is haunting the Lighthouse.
How’s this theory:  below is the photo of the Confederate soldier’s ghost image taken at the Lighthouse some years ago.  Wonder if the old boy has the keeper’s daughter locked up somewhere in that Lighthouse?