I think it is a set of elements, first she must feel a kind of affection, second she must be reciprocated: the Duce Wolf does not believe in his lady, well one who tells him that you have to have a baby like that without knowing each other makes her look like a hunter of dowry, and the duke has been betrayed too many times and so rejects her, in his canine form the wolf is certainly treated more human than how she treats her fellow men.