I don't think it's possible that Robin invested too much of herself in her kids....#1 Dr. Phil would probably have gently guided her away from that, and #2 I don't think there's much credence in "too much time" or "to big an investment" when it comes to your kids. Too many families have, for the past 2 or 3 decades, been too willing to give up their parenting duties/skills to teachers at school. After all, "that's what teachers are trained for". B.S. Teachers are trained to teach, not to parent all the children of everyone else. And if parents are not willing or able to invest a lot of themselves and their time in the children they give birth to, they should probably have been on better birth control. Having children irresponsibly is as bad as parenting irresponsibly.
While I raised my kids for 18 years by myself (and ex-hubby did not even contribute support money), many of my friends, most of whom parented in two-parent homes, told me constantly that I was too overprotective of my kids, that I was too strict, I didn't give them enough space to grow or grow up. More B.S. Out of about 8 families that I was close to in the neighborhood, my kids were the only ones who never spent a night in juvenile hall, never acquired a police record, graduated on time, learned to drive a stick-shift, paid their own auto insurance (or didn't drive...their choice), never even got a traffic ticket and are now in their mid-thirties. They are excellent, responsible, mature adults. They are also very grateful that I raised them the way I did, and they tell me several times each year how thankful they are that I didn't pay attention to them or the other people. I went from being the "meanest mom in the whole world" for several years, to being the wisest, smartest, most gifted parent ever made. That is, according to my kids now.
So, leave Robin alone. She'll do fine. She has other things to do, and will do them when she has free time. And yes, she, like me, will continue to worry about the kids, even into their 30's; because that's what MOMs do.