I also doubt that Kody would add another wife at this point, especially after saying he was having problems keeping the current ones happy. I saw an article about Mary recently. It looks like she is living in Utah and running her B&B. It was closed for two months after her mom passed away, and now it's open again. She posted something about how she would "find a tribe that will care about and support her." Not sure if that means she's actually splitting from Kody and the family, but she has a tendency to post cryptic messages. It seems like she remains closer to the family while they're filming so she can be included (and get paid!).