In Dawn of Sorrow, it says "priest" in the library entry for the Battle of 1999. Quoting from gamefaqs "The Battle of 1999 - The battle that permanently destroyed Dracula. Nostradamus's prediction of the King of Terror was for Dracula's resurrection. However, the priest of the Hakuba Shrine sealed his castle within a solar eclipse, cutting Dracula's soul from his power and thus freeing it from the chains of destiny." Mina is described as "Soma's lifelong friend and the sole daughter of the Hakuba Shrine's priest."
Charlotte does seem to have a large role in the defeat of Dracula though (if she lives up to everyone's expectations). The Portrait of Ruin manual says about her "Has great magical power, and is seen as the potential final weapon in the battle against Dracula." I do wonder how she will be able to contribute. Everyone knew that Dracula would rise in 1999, so why would they think that of her? Maybe she did the research that gave them the idea to get the shinto priests involved? That has nothing to do with her power though. Umm, or she could have time traveled...