People in general react really poorly when family business gets aired in an incredibly public way like this. For many people that's almost a greater taboo than the infidelity.
I don't think an adolescent is going to read it like "Oh it's Dad's fault that now everyone knows our private business". She's been silent on this matter for many years at this point, so a teenager is more than likely going to have an opinion more along the lines of "Why did she have to speak out NOW?"
OK, well, IF her teenagers feel that way, they would be wrong and they'll learn to appreciate her taking a stand for herself, when they are older and wiser. Someday, when someone is misrepresenting them to others, they'll reflect on how their mother had the courage to tell her side of the story. (And if they haven't already, someday they're going to really reflect on what their father did to their mother, and it will change how they look at him).