I couldn't find an exact reference to the New England Woman Suffrage Association. But, here is a quote from Wikipedia (Women's Suffrage in the United States) giving the impression that this might have been The New England Women's Suffrage Association: "On July 19–20, 1848, in upstate New York, the Seneca Falls Convention on women's rights was hosted by Lucretia Mott, Mary Ann M'Clintock and Elizabeth Cady Stanton; some 300 attended including Frederick Douglass, who stood up to speak in favor of women's suffrage to settle an inconclusive debate on the subject. Lucy Stone met with Paulina Kellogg Wright Davis, Abby Kelley Foster, William Lloyd Garrison, Wendell Phillips and six other women to organize the larger National Women's Rights Convention in 1850; a speech she gave the thousand-strong audience inspired Susan B. Anthony to join the cause.
From what I can tell and also in the article was that The National Woman Suffrage Association was organized in 1869 by Susan B. Anthony and Elizabeth Cady Stanton. Also, in 1869, Lucy Stone organized The American Woman Suffrage Association. In 1890, the two groups united to form the National American Woman Suffrage Association.
Hope this helps! Good Luck!