There's a lot on her on the web. I searched by "Julia Cooper," and found one of the most detailed answers right here on answers.com. http://www.answers.com/topic/anna-julia-haywood-cooper One of the...
I was looking up this myself. It appears she wrote a poem late in her life. see: http://findarticles.com/p/articles/mi_qa3626/is_200610/ai_n18705756/pg_8