There was an effort to try and find funding for a movie about a real frontier heroine - Betty Zane.
Failed to get the funding.
http://bettyzanefilm.blogspot.com/
No interest from the movie moguls!
Re: movie about Betty Zane
Zane Grey wrote a novel about Betty Zane; it might make a good outline for such a script.
In fact, Many of his westerns would make good movies, and have made good movies in the past. The only one I can think of recently is “Riders of the Purple Sage”, with Ed Harris (I think) as Lassiter.