I couldn't agree more with every word of your post especially
'
She seems like she has something big going on behind the scenes and is taking it out on him.'
She seems to be seething, distracted, vacant, bored, angry, sad. Her skin is clearly irritating her, she never stops scratching it. She gets drunk (that's ok, but not to that extent with children in the house and NOT film it and expose herself, because as you say, how do you come back from that level of public degradation? She looks lonely, which I'm afraid she has brought upon herself.
That woman could do with going away to some sort of rehab to deal with emotions, her social media addiction and even grief regarding her 2nd husband.
She needs to be surrounded by women and men, she needs hardcore 7 days a week group therapy and one to one therapy. Healthy food, balancing exercise, a clean room to sleep and reflect; in a place that she won't want to leave because it cost so much to go there. 3 months minimum stay.