What's interesting about this scene is when she's inside, doing the laundry, with both girls crying their heads off. Those kids had been crying for a while, too--you can tell by the pitch. Mothers are pretty much hard-wired to pick up a crying child, especially a baby, but it's Ennis, just coming in, who goes to get them up and comfort them. You notice that baby seems to cry an awful lot when Alma is holding her? You can tell that Alma is feeling a little stuck, a little frustrated.
I also got the feeling from my last viewing that Alma divorced Ennis primarily for financial reasons. It seemed that she was willing to stay with him and share him with Jack if he'd at least be a decent provider.
camom