I think this tends to be more of a symptom of other problems than an isolated problem in itself. Can you get her to talk to a psychiatrist or clergyman? Maybe they could help her.
A friend of mine's wife went through this for a while, but I think she's recovered now.
Unless the clergyman is a trained, skilled, experienced professional, this is way out of their league.
They can be useful adjunct, at best, imho.
And I'm a big fan of clergymen helping in family problems.