My theory that there must nearly always be some kind of horrific, life altering tragedy in the life of a mommy blogger in order to lift her up into the heights of superstardom. (In this case, superstardom means the level of traffic that is required in order to make a full time blogging income from display ads alone, which I'm placing at about 500,000 pageviews or more per month.) You can get there without the EVENT, of course, but it's harder. And you can get closer to it without the EVENT, but the EVENT almost always makes it happen.
It is critical that this EVENT is something over which the mommyblogger has no control, and that she did not seek to create for herself, but which merely happened as the result of living her life like a normal person. And her traffic increased as a natural result of her desire to blog through this tragedy with authenticity.