Short answers, pulled from the story.
Mirabehn was born Madeleine Slade on the 22nd of November 1892, the daughter of British Rear-Admiral Sir Edmond Slade. After reading Romain Rolland's biography of Mahatma Gandhi in the early 1920s, she left England to join Gandhi's ashram in India in November 1925. Gandhi named her Mirabehn after the Hindu mystic Mirabai and called her his daughter; she remained his close associate for decades.
A chance meeting with author Romain Rolland at Villeneuve led her to read his biography of Gandhi. Rolland described Gandhi as another Christ and the greatest figure of the twentieth century. After reading the book she said, "I could not put it down... From that moment I knew that my life was dedicated to Gandhi."
Mirabehn was arrested at least three times. After Gandhi's arrest in 1931 she was jailed at Arthur Road Jail for three months. She was arrested again in 1932 for entering Bombay without permission and served a longer term at Sabarmati Jail. In August 1942 she was arrested with Gandhi during the Quit India movement and held at Aga Khan Palace in Poona until May 1944.
While living in the hills of Kumaon and Garhwal after Indian independence, Mirabehn observed the destruction of forests and its link to flooding in the plains. She wrote an essay titled Something Wrong in the Himalaya warning about the damage, but the Forest Department ignored her findings. The same region later became the site of the Chipko Movement, a Gandhian environmental campaign to save the forests, in the 1980s.
Mirabehn was awarded the Padma Vibhushan, India's second-highest civilian honour, in 1981, one year before her death on the 20th of July 1982.
Mirabehn wrote an autobiography titled The Spiritual Pilgrimage, and published Bapu's Letters to Mira and New and Old Gleanings. A fourth work, Beethoven's Mystical Vision, was published posthumously in Madurai by Khadi Friends Forum in 1999, with a digital second edition issued by MGM University in 2000.