The only part I have a problem with is her attempting to sleep train (and using CIO as part of the training) at 8 weeks old. That's just too young... both IMO & from what I read when trying to get a handle on my daughter's horrible sleeping habits.
We used CIO as part of our sleep training with DD starting at 4 months old. We used the methods described in Dr. Weissbluth's book, Healthy Sleep Habits, Happy Babies. It was a pretty extensive, gradual approach that didn't start out with just putting her in her room, closing the door & not opening the door again until the morning but we DID let her CIO after we got to a certain point in the training. And I have nothing but good things to say about it. She went from being an awful sleeper & generally unhappy baby to having a great routine and being a happy child.
Even though I did CIO with DD, I'm not dead set on doing it with my next babies. I think every baby needs a different approach to parenting and sleep training (if they need "training" at all). If the twins don't need it or will respond better to other methods, then that's what I'll do.
Different strokes for different folks... different approaches for different babies.