Yes, the topic is suitable for a research project.
The prerequisite for a topic to become a research project is to have scientific support.
The story has scientific methodologies to study the lives of personalities who were important to humanity. Eleonor Roosevelt's case fits perfectly. She was a human rights activist, and left her legacy in support of the Universal Declaration of Human Rights.
In this way, understanding the processes of identity formation of Eleonor Roosevelt is important not only for history, but for other branches such as psychology.