I think America just wasn't ready for her. Some people spoke about her as if she was too ditsy to be president, but if anything, she was too smart. The truth is the American people simply have a limited understanding of who can do what. And while she didn't let that limit her on a personal level, it did limit her from becoming president.
Kamala is simply ahead of her time. And someday when the American people are able to think more holistically, they might elect a woman of similar holisticity to chart the course for America in a more holistic manner.