PBS Ken burns civil war who was old black lady did poetry?

You are likely referring to Frances Ellen Watkins Harper, who was a prominent African American poet, novelist, and social activist during the Civil War era. While she didn't appear in the Ken Burns documentary itself, she is prominently featured in the accompanying book and is discussed in the context of the war's impact on African Americans.

Harper's poems, like "The Slave Mother" and "The Two Offers", gave a powerful voice to the experiences of enslaved people and advocated for abolition and equality. While not physically in the documentary, her words and legacy live on as a poignant representation of the Civil War's impact on the lives of African Americans.

It's important to note that there are many other notable Black women who contributed to the Civil War era, including Sojourner Truth, Harriet Tubman, and Elizabeth Piper Ensley, all of whom played vital roles in fighting for freedom and equality.