Interesting, but I think it's telling that I forgot that I had already read it. I read it on the heels on her Women Who Kill book, and she made the same erroneous statement in both books, without sourced material. I say it's erroneous as a former (disabled) therapist, who has studied this material in great detail, and I quote directly: 

What psychologists? Who? This is a false, dangerous, and hurtful statement, and again, it's in both books. There can be anger and even rage involved in some suicidal ideation. Not all. And those feelings are not always aimed at other people. This really disturbed me, to the point of almost DNF.