Of course that's her real name and not the one of the "character" (real life person) she portrays, but it's fitting nevertheless. She won't take anything from anybody, no matter what the point is. And she will stand up for something when others just idly stand by and maybe even just watch what is happening.
We go through a lot of history of what happened to this person and how she became a fighter and an atheist. The last fact alone may make her a bad apple for some and put her in a corner she can't recover from. But you know there is a reason for this title of hers (and the movie). Performance is grand and it's really a gripping story, jumping back and forth in time. It works and while not many will be completely satisfied with the work/movie itself, it's really something good, with flaws and all.