No. Actually having her father there might help her with her exposure. While walking with her father she would need to imagine different types of scary scenarios to try to bring up her anxiety level. Initially, her anxiety would be worse but eventually she will acclimate. If done correctly, that little girl will soon be walking on her own to school. However, if she was just using her father as a constant reassurance, she’d likely to grow an increasing dependence on him. (This is true if a person has anxiety. I’m not sure its applicable to someone who has a rational fear.)
A basic component of this type of therapy is a person’s commitment to accept uncertainty and be willing to take risks so that he can live normally. I’m no scholar, but perhaps this is how you answer the question.