I’m watching the episode now. The bishop and SP just came to visit Barb at home. They mentioned that she and Bill haven’t paid tithing for seven years. She says yes, they’re “inactive now,” they went through a bad time, and she was very sick. So the bishop just comes right out and asks if she’s living in a polygamous relationship. She’s shocked by the question, but after a pause acknowledges that she is. She explains that Bill got a testimony of it. She didn’t at first, but she thinks she does now. They informed her that they were there to determine whether they needed to take action regarding her membership.
I’ll post this now and then in the comments describe the further developments as the episode unfolds.