A broad audience showed up for Barbie….it would not of become a billion dollar film without itBarbie is definitely a girls brand and I'd guess that helped it. I don't believe Disney wants a film of this profile and budget to be labeled a "girl" film. I can't see a scenario where this budget isn't massive. So it's probably going to need a fairly broad audience to show up.
As far as the strong female characters go. I have two daughters and there is no shortage of female characters for them to latch on to.