[2] She was a founders of the Lawrence General Hospital, its first physician, and the medical and surgical supervisor of all its departments.

[5] She was a descendant of Dr. Samuel Fuller, who emigrated from England in the Mayflower in 1620 and was the first physician and surgeon in the United States.

Although not supposing that she would ever be able to realize her early wishes, she yet fitted herself in literature, history, natural science, and the languages, and in 1871, she took three full courses of medical lectures at the Woman's Medical College of the New York Infirmary, and graduated on April 18, 1874.

She was on the regular staff of physicians and surgeons of the Lawrence General Hospital from its founding until she left the place.

[5][6] Crocker was the author of a paper on “Food Poisoning,” read before the Essex North District Medical Society, an abstract of which was published in the Boston Medical and Surgical journal (now The New England Journal of Medicine;) “The Medical Profession and the People,” read before the same society, May 6, 1891; “The Prevention of Disease,” read at Mechanics Building, Boston, in the literary and scientific course of the Massachusetts Charitable Association Fair, October, 1892, and afterward, published in Health.