Are there no pristine 3-strip nitrate prints of this anywhere?
I'm sure the transfer wouldn't be as good as what we are going to see from Twilight (I'd imagine it'd look more like the Selznick releases from Kino,) but I hate to think the reference exists nowhere.
It is, what it is, thank God for technology that keeps advancing and will continue to do so as we can at least watch this great film in a video presentation that most of us will still be very satisfied with. However, the following pretty much answers your question:
Like the rest of the Fox library, all of the original elements for Leave Her to Heaven were poorly copied, and then junked in the mid-'70s.
But here's where some interesting digital technology comes in, and led by Fox's Schawn Belston, with support from The Academy of Motion Picture Arts & Sciences and The Film Foundation, the film is once again far more than viewable.
While Leave Her to Heaven looks nothing like it would have from pure three-strip Technicolor negatives or fine grains, with the work performed, we can get a very good peek inside that look, and still come away impressed.