The rumours were that Patty Jenkins had a lot of help in the first film from Zack Snyder. Based on the performance of the first film, she was allowed to do her own thing, but the first version of the 1984 film was... not good. There were massive reshoots (rarely a good sign), and what we've got now is also a poor film.
If you look at her directing credits, she's had one big hit in Monster (due to Charlize Theron's acting), Wonder Woman (with Zack Snyder overseeing), and that's pretty much it, so I wonder if she's been promoted beyond her abilities, but the optics of a female director for Wonder Woman are obvious.