I agree with a PP that to be really blunt, the author's career choices would likely be eviscerated at this point in time, whether or not she SAH. WOH moms get penalized too (as she points out in her own article), and mainstream, stereotypical journalism is bleeding out quickly and what jobs remain are fiercely competative. (Let's not also forget the ageism bias that women are up against far more than men as well.)
WOH moms often are devastated financially from a divorce as well. They are not magically prevented from financial ruin of divorce more so than SAHMs. In fact, the impact of them may be more because there are even less safety net stuff available to someone with a halfway decent income pre-divorce than a "displaced homemaker".
I feel sorry for the author. She's going thorugh a devastating, stressful time. I think it's a little simplistic and naive to look back and say, "Oh, if I'd only never SAH this wouldn't be happening." I sincerely doubt that. The blunt truth is that most women whether or not they work outside the home are extremely vulnerable economically if they get divorced. Women still face enormous prejudice in the job market, esp. when it's cut-throat, and anyone who says that a single mom (of any stripe) doesn't face additional bias (both unjustly and pragmatically) from employers is being pretty ignorant.
I hope that the author gets through this difficult time and is able to eventually find some amount of peace in time--and that she doesn't heap too much blame upon herself for "causing" this. the truth is, even if she were a professional woman this whole time, she still probably would be facing some pretty severe challenges, esp. newly single with children to care for. When you are in crisis, you question everything. It's natural to question SAHing too, though I think extrapolating that while ignoring the very real struggles and difficulties faced by WOH moms after divorce is a really big mistake. Understandable when you are in the thick of your pain, but that does skew your perception of reality.