I think, based on nothing more than a day or two of googling, that she "probably" was involved. I don't have a lot of confidence in my opinion, but if I had to guess, the chances are over 50%.
I respect the court's opinion, they know more about it than me. There were a lot of problems with the evidence, and at least in my mind there is reasonable doubt -- "probably guilty" is not enough basis to imprison someone. If the decision had gone the other way, I would have respected that too, but that didn't happen.
I do think that ironically she benefited from the Italian incompetence that people were saying that she was a victim of. In the US, the mistakes during collection and examination of evidence wouldn't have been made, and I think the whole investigation would have been more thorough. Of course, maybe this means that she would have been cleared immediately, but I think that a better investigative team could have proven her guilt.
Anyway, in the end I think justice was served. She didn't get off scot-free, she served 4 years, but she didn't get a really lengthy life-destroying sentence. So I think in the end the bizarre Italian justice system worked out pretty well, even if it was just by coincidence.