On the part of the quest GLC.E109 File in Glast Heim Churchyard, there is the last objectives that you need to find the Soul of Gabrielle, that usually seen in the deep of the cemetery (exploration).
Lot’s of players has hard time looking for Gabrielle in this quest, because it is not mark on the map to help players complete the objectives.
Actually, Gabrielle is just inside the Glast Heim Churchyard, just outside of the ruin Church. At the right top corner of the map.
There he is! See the screenshot for the exact location of Gabrielle.
After that, the last pieces of the item for the GLC.E109 File will be added to your bag.
You may check our walk-through video guide, for reference.