Her extensive personal knowledge of her native state of Maine secured her place as one of the foremost authorities on the history, wildlife, cultures, and lore of the region.

In 1891 she wrote a series of articles examining Maine game laws for Forest and Stream magazine.

Her next book, The Penobscot Man, which was published in 1904, celebrates the lumbermen and river drivers that populated her childhood, and her 1907 book David Libbey: Penobscot Woodsman and River Driver creates an in-depth profile of one of those men.

[5] The following year Eckstorm founded Brewer's public library while continuing to publish articles and critiques, most notably a review of Thoreau's Maine Woods.

The couple had two children, and later moved to Providence, Rhode Island, where Jacob Eckstorm died in 1899.