I'll tell you how I had to find where the nanny was.
After I came to the orphanage and I had remembered the fate of the orphanage, I immediately searched for the nanny's whereabouts using the Hear of Everything skill.
The first thought that entered my brain was to take all the money that she took away.
But I couldn't leave right away because it would look suspicious in Jeanne's eyes. I just marked the direction she was headed and waited for things to calm down. Only after I took the children to the inn did I go to meet her.
Since I had marked the direction she was headed, I didn't lose track of her.
Using my body-strengthening skill, I ran and managed to reach a round metal door on a deserted street with no other people in sight. The round iron door was an entrance to the culvert which was she chose to escape.