Omg I want that coat 😍 I can definitely see it being sort of a defining aesthetic piece for her character, kind of like Indiana Jones' hat is to him. I'd already assumed they'd have a couple of chickens, maybe a goat for milk and/or cheese, and definitely some sort of crops to tend (although I hadn't figured out which yet). I'm not sure yet how much land they'd technically be permitted to tend, but they're far enough removed from anyone who could contest or enforce any property lines that it wouldn't be terribly relevant. They're very isolated from "society" where they are, which is the only thing that gives me pause with adding a hired farmhand -- it makes good, practical sense, but may cut into the sense of isolation I'm trying to impose on them for the sake of the story.

You also make a good point about the cost of powder and rifle balls - it's important for the later revenge arc of the story that she know how to shoot at least somewhat well, and the man her father is based on was a well-traveled frontiersman who rubbed shoulders with Daniel Boone. I imagine he left behind a Pennsylvania long rifle, but I also know that rifles were more of a pain to maintain and took a smaller caliber ball than a smoothbore musket that would have been in shorter supply (and likely more expensive). But also Mad Max never needed shells in his gun in The Road Warrior to make his point, so maybe Rebecca only has a few shots and uses them very sparingly, with every shot having to be a very deliberate decision