I thought it was a humane response. It isn't a therapist's job (or a mock-therapy journalistic article's job) to make a judgement about whether someone married the right person or not . It is her job to help someone untangle feelings of obsessive regret. And that is, in fact, what the woman asked for help with. She spoke of invasive, unwanted thoughts and asked how to banish them. It is the woman's responsibility to decide whether the guy is the right one for her to be with. And she has made the choice to stay.
Perry doesn't say that the woman 'didn't make the wrong choice'. She says that the woman's choice isn't the cause of her obsessive regret. Rather, this regret is the reslut of a 'pattern is that whatever choices you make, you assume they are the wrong ones'.
The is a common pttern and a very destructive one. It is particularly common in people who are depressed. Its legitimate to focus on that, rather than on decades-old decisions.