Why is Titania unable to use her magic to save the boy in the story, A Tiny Feast?

The narrator explains that Titiania's magic is only effective is she is indifferent toward something. She loves the boy dearly, thus, she cannot save him. This phenomenon suggests that one of the most difficult aspects of parenthood is that the more one loves one's children, the more powerless one feels when they cannot shield them from pain and suffering.