Firstly introduced in Harry Potter and the Goblet of Fire
, Rita Skeeter's unregistered Animagus form of a water beetle had hidden her when she had interviewed the Slytherin students and overheard many conversations, including Hagrid's one with Madam Maxime. Furthurmore, she had a talk with Hagrid, then jotting down an untruthful Daily Prophet
mentioning Hagrid and his half-wizard half-giantess parentage. Who was (meaning by the name) Hagrid's mother?