She's attacked by maybe a neighbor? in a black flat-crowned cowboy hat just a few minutes (of movie) after the husband left.
She wakes up on the bed with a bloody pillow under her head, and has to go to work in the saloon. The owner says something like "this is your only warning to be punctual" and then he sees her bruises as she's tying in her apron. As he is staring at her face, the perpetrator walks in with his own bruises, notices he's being stared at as people make the connection, and he backs out. That's the last thing I saw.