This is fairly broad. Leaving the Colonial period, I think that there are many examples from which you can choose. Women like Sojourner Truth, Lucretia Mott, as well as Elizabeth Cady Stanton or Susan B. Anthony would be excellent examples of women who laid down influences for activism on the level of gender. I think that you need to be a bit more specific as to what kind of women activist for whom you are searching. I think that being able to explore the different types of activism would be a start. What type of activism are you looking for in your research? There are many, such as political, economic, social, or psychological forms of active resistance, to name a couple. I think that being able to identify what type of woman activist you seek might be a good starting point in assessing your needs for this work and such a topic.
The Temperance Movement emerged in the 1820's and concerned itself with the abolition of alcohol. This movement was dominated by women however did not exclude men from their meetings. This movement is considered the first organized women's movement. Among the leaders was Frances Willard, she organized the Women's Christian Temperance Union in 1874 and it continued to grow in the subsequent decades. The Temperance Movement is in many ways responsible for women's involvement in future movements. Sarah and Angelina Grimke were active in the Abolition Movement. Lucretia Mott and Elizabeth Cady Stanton organized a Women's Rights Convention in New York in 1848, which promoted the Suffrage Movement-voting rights.