As an adult, Kilbreth shared an apartment with her brother John William in D.C. She never married or held a formal job.
Her other reason for being against women voting is that "woman suffrage means the gradual advent of feminism, destruction of family unity, duplication of effort and combining of sex natures toward a weak medium, and will have an adverse effect upon civilization and posterity".
On October 9, 1919, she wrote to Thomas Walter Bickett, the governor of North Carolina, asking him to oppose the ratification of the 19th amendment to legalize women's suffrage.
She stated that she and her organization were not "protesting against women suffrage per se, but against the settlement of this issue by Federal action".
Kilbreth also opposed the Sheppard-Towner Maternity and Infancy Protection Act (1921), which established national health education and aid for expectant mothers.
[13][14] Kilbreth made her opinion known, writing to President Warren G. Harding that his signature on the bill was "inspired by foreign experiments in Communism, and backing by radical forces in this country".
[14] Even after the act was passed, she wrote a petition presented to Congress by Senator Thomas F. Bayard Jr. on July 3, 1926, opposing the renewal of the bill.
She claimed that communists and socialists were pushing women to support welfare initiatives that would harm the parent-child relationship.
At some point, it seems that Kilbreth sent a letter to the Women's International League of Peace and Freedom about a member's oath.
In Kilbreth's article "The New Anti-Feminist Campaign" in a July 1921 of The Woman Patriot, she directly states she is answering "Mrs Catt's" question "What is Feminism?".
[18] She describes it as "a world-wide revolt against all artificial barriers which laws and customs interpose between women and human freedom".
"[11] The Great Depression, starting in 1929, put new financial pressure on the WPPC and capped their direct influence.