Almena was the daughter of Stillman and Susan (Whitaker) Guptill. She married Edward August Baker, son of Thomas J. and Martha (Gates) Baker, on 2 July 1866 in Boston. Edward died in 1889. Almena then married David Boardman Flint on 22 June 1891 in Boston.

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"Baker, Almena Jane, M.D., was born in Winter Harbor, Gouldsborough, Me., April 5, 1842. Her early education was attained in the common and high school of Gouldsborough. In 1876 she graduated M.D. from the Boston University Medical School, and subsequently studied in European hospitals, spending a year in Vienna, Berlin, and Paris. She was physician to the Boston Homeopathic Dispensary for two years, and has been a member of the medical staff of the Homeopathic Hospital for about seven years. She is also president of the "Sunny Bank Home" at Watertown, for convalescent women and children. In 1881 she was sent from the American Institute of Homeopathy as a delegate to the Internation Medical Congress, held that year in London. She is a member of various other societies, including the Massachusetts Homeopathic Medical Society, of which she has been president and also secretary; the Massachusetts Surgical and Gynaecological Society; the Gregory Society; the Alumni Association of the Boston University Medical School, at one time its president; the Society for the University Education of Women; and the Women's Educational and Industrial Union, serving upon its board of directors. Dr. Baker has been a frequent contributor to the medical journals."

From: "Boston of to-day: a glance at its history and characteristics: with biographical sketches and portraits of many of its professional and business men," Herndon, Richard (1892)