I think she must have shown some affection for Nuka, or he wouldn't have been as devoted to her. Still, it's not in her nature to act motherly. And she only mourned his death for, like, five minutes XP Poor Nuka D:
awww...poor Nuka. but this is an absolutly amaing pic!! i could tell right off who the cub was!! i usualy have trouble recognizing Nuka as a cub. an Zira...wow. this looks like a screenshot from a deleted scene!