Are my daughter's stories made up?

My 3 year old daughter keeps telling me about her friends, Endin and Curdle. She says that she met Endin in a police station and Curdle was a doctor. They used to live in a wardrobe but now they've moved far away. I'm not sure if this is the work of a childrens author (a story read at school, maybe,) or if my little girl is making all this up herself. The weird thing is she can describe them vividly, as if she knew them in person. She even said Endin smelled like she smoked. I've heard her talking to herself, but as if she was talking to Endin and Curdle. I just wondered has anybody ever heard of Endin and Curdle books, or are they cartoon characters? Or has my daughter made this up?