Wendy is a travel spirit. This is a trigger which makes dormant spirits become active. When you have a trigger their job is strictly to get the spirit comfortable with you, aka acts as the middle man. Because of this it is very difficult to get a full bio on a trigger spirit. I am able this gather Wendy is in her late 30's. She was never married nor had children. Also, which I found interesting was she was always a non believer of the other side until after she had passed