Born Sarah Ann Isaac in Liverpool. Hood was a music hall performer as a child by the age of 11 under the name Marion Isaac. She married a Mr. Hunt of the Alhambra PalaceMusic Hall in Kingston upon Hull. In 1876, she had moved to London to study singing at the Royal Academy of Music. Her husband had died by 1880. In 1880 she made her London stage debut at the Opera Comique, joining the D'Oyly Carte Opera Company and creating the role of Mabel for the London production of The Pirates of Penzance. According to her colleague Rutland Barrington, Hood was "a perfect picture to look at and equally pleasant to listen to... tall, slight, and graceful, a typical English girl with a wealth of fair hair, which I believe was all her own. Her singing of the waltz song, 'Poor Wandering One', was quite one of the features of the first act ." The New York Times wrote that she had "a soprano voice of rare flexibility and power." After that engagement, Hood left the company and married her second husband, Mr. Hesseltine, taking a brief break from performing until August 1881, when she appeared as Constance in the first production of Stephens and Solomon's Claude Duval at the Olympic Theatre, with George Power who had been her partner as Frederic in Pirates. She then sang at the Alhambra Theatre and Avenue Theatre, performing in Frederic Clay's Golden Ring and Karl Millöcker's The Beggar Student. After this, she toured the British provinces in grand opera, appearing as Marguerite in Faust'', in which role she then appeared at the Crystal Palace.
Later years
Hood next appeared in Billee Taylor at the Gaiety Theatre in 1885 and Little Jack Sheppard in 1885–86. She then created the title role in B. C. Stephenson and Alfred Cellier's hit Dorothy beginning in 1886, playing in the show for 350 performances until illness forced her to withdraw from the cast. She soon returned to the Gaiety to star in such burlesques as Monte Cristo Jr., Miss Esmeralda, Frankenstein, or The Vampire's Victim and Ruy Blas and the Blasé Roué. In 1891, Hood returned to London in a burlesque of Joan of Arc, or the Merry Maid of Orleans. A reviewer wrote, "Miss Marion Hood makes an attractive Joan of Arc, sings the airs allotted to her so as to win plenty of applause, and only fails where the delivery of certain declamatory speeches overtaxes the strength of her voice." She also toured in Australia in 1892 in Carmen up to Data among other things. Her last appearance on the London stage may have been as a member of the crowd in court in Trial by Jury at the Nellie Farren benefit in 1898. According to historian Michael Walters, Hood "had a bitterly unhappy life, though this was never reflected in her stage performances." She died in Thanet, Kent at the age of 58.