Howdy redheadpei! haha! yeah that is not the Hollywood version of Sundance that's the real version. lol. Sorry.
I truly hope that Etta made it back and most historians think she did but there is no proof of that, at least not yet.

Call me a hopeless romantic but I don't think her and Sundance would have seperated. And if they did I don't think he could have not been writing her like crazy or resisted taking off and going to see her. Instead, none of that happened and neither of them ever spoke of her again?