This was, overall, a nice watch. Well acted and well written and I'm always a sucker for well designed and appointed period pieces. Julia has enough of the elements to remind me of the actual historical figure she's playing and I bet, coming from Georgia, she's familiar with the type. It feels like it.
But they make a key mistake I have trouble brushing away and, honestly, I don't want to: they whitewash the unpleasant parts of the woman this is about, who had views ranging from unpleasant to outright bigoted that she was just as open and loud about. By rewriting, ignoring, and washing away those parts of her we're denied the honest, complicated, powerful portrait of a flawed woman of her time who did such an important and ultimately honorable thing.
There's no reason to make her a hero to the point when people go to research her they are surprised and put off. The kind of complicated character we're talking about is pure awards-bait for actors and writers. Think of Mare of Easttown, for example, Ray Donovan, even Archie Bunker. A character does not need to be all good or all bad or purely likeable to be compelling and even respectable for the good things they did do. They really missed the boat on that part.