Tonks and Kingsley act as spies for the Order in the Ministry. She helps to escort Harry first from the Dursleys' house to Order headquarters, and later to the Hogwarts Express. Tonks later fights the Death Eaters at the Department of Mysteries, in which she is injured by Bellatrix, and has to be taken to St Mungo's. During "Half-Blood Prince", Tonks is stationed at Hogsmeade and assigned to guard Hogwarts. Harry observes she is constantly depressed and rarely smiles. Also, he sees her hair is a mousy brown instead of its usual bright bubble-gum pink. After Dumbledore's death, it is revealed that Tonks has fallen in love with Lupin, and her Patronus has, as a result, changed to the form of a wolf. Lupin is reluctant to return her affections arguing that he is "too old, too poor, and too dangerous" for her. Because of this, she falls into a depression that disturbs her magical abilities including her ability to change her appearance at will.