Divine Science is unusual among the New Thought bodies in having no single founder, and the way it came together says something about how the whole movement worked.
Cramer arrived at her position alone in San Francisco in 1885. Some six hundred miles away, in Colorado, Nona Brooks and her sisters arrived at a closely related one within a couple of years, out of a class taught by a student of Emma Curtis Hopkins. Neither party knew of the other. When they met, at one of the association gatherings, they found the teaching substantially the same, and the Denver group adopted Cramer's name for it, so that a single tradition now had two starting points and two centres of gravity.
That pattern of independent arrival is characteristic. The ideas were circulating in classes, magazines and personal letters, and the movement's teachers regularly discovered that a formulation they had reached privately was already in use somewhere else. It is the reason a founding attribution in New Thought is nearly always contested, and it is why the atlas records Quimby as precursor rather than founder and holds the Religion-level founding relation as debated.
Cramer was caught in the San Francisco earthquake and fire of April 1906, was injured, and died in August of that year. Leadership of the tradition passed to Denver, where Nona Brooks had built an actual church, and the San Francisco work did not survive her.