The Blue Peacemaker.
I found something very interesting with The Peacemaker and the blue barrel. But I'll start with the Earp sisters killing/wounding revenants in Shorty's. I think that is also curious that the three of the Earp sisters did that in the bar.
Wynonna
Willa
Waverly
We all know that Shorty's is a kind of masonic holy ground. Considering that Purgatory is also a sanctuary was crazy how Rosita could work there being a Revenant.
Now, the blue Peacemaker.
We also know that the barrel of the gun was blue when Wynonna shooted Willa at the cemetery. The big holy ground of all. And I didn't saw Willa dragged to the hell when Wynonna shooted her, she just vanished. So, Willa and Wynonna are the heirs and they have to send revenant to hell (aKa yellow barrel) and that was what they did at Shorty's but Waverly? She shooted the gun and the barrel was blue, and she is not the heir that have to send Revenants to hell, But What if she can sent the demons to heaven? or at least erase them of being demons when she have Wynonna's age? I think that the people refering to her as an angel is for something. What exactly, I don't know but Purgatory is the pass between hell and heaven and the Earp sisters are there for a reason. What if Wynonna is the one to send demons to hell, and Waverly is the one to send this kind of people to heaven? Or save them?
Rosita could be her first revenant to save. The fact that she didn’t die have it reason and the fact that she and Waverly have this kind of friendship?
Besides, Rosita saved Waverly’s life from Tucker Gardner have to count too, I think?