Are documentaries a pathway through the glass ceiling for female directors in the fictional narrative arena?

Consider this a slightly interesting bit of news that hopefully will be a sign of things to come.  I generally don't post every press release I receive, mostly because there are other places you can go for that kind of thing.  But the press release regarding what was basically a casting announcement for Dakota Fanning caught my eye.  The film is called Every Secret Thing and it's also starring Diane Lane,  Danielle Macdonald, and Elizabeth Banks.  It concerns "two 11-year-old girls who are convicted of murdering a baby and are incarcerated until they turn 18.  Upon their release, children start to go missing; as the police turn their attention to the duo, the mystery surrounding the original murder comes back to light." The film's director is one Amy Berg.  Okay, so you have  female-driven film starring several major female talents and directed by a female director.  Always good news, but so what?  Well, Ms. Berg is making her feature film debut on the project, having previous cut her teeth in the realm of documentary film-making.