She's playing Evelyn Johnson and played by Francesca James who was another character in the 70's on AMC. We don't know how she is connected to the cast yet but it looks like the new girl Celia is connected to her if you saw the first episode.
The woman in the opening picture is Evelyn, according to the caption. When he visited Jesse and Angie, Joe said Ruth had stayed home. We've seen, Evelyn with Celia, but we don't know what her connection is to Joe--yet.