She subsequently became a prominent advocate on behalf of the Iroquois Nation, helping to defeat the Indian Reorganization Act in New York.

Historian Laurence M. Hauptman credits the report, which concluded that the Iroquois had a legal right to 6,000,000 acres (2,400,000 ha) of land in New York as a result of treaties signed in the late 18th century, as being "largely the work of Lulu Stillman".

[1] She became a major critic of John Collier and the Indian Reorganization Act (IRA) of 1934 and was noted for having "distrust" in the intentions of both New York state and the federal government.

"[8] Hauptman describes her by the 1930s as "the most respected outsider in Iroquois political circles who had supported the long crusade to win their lands back".

[9] Also in 1934, C. C. Daniels, the special assistant to New York Attorney General Homer Stille Cummings, met with Stillman.

Griffith made three copies of the Everett report that Stillman had preserved from September to November, adding a five-page introduction.