Firstly her comment was dispicable:

My husband did not wrap up the nomination in 1992 until he won the California primary somewhere in the middle of June, right? We all remember Bobby Kennedy was assassinated in June in California.

But to add insult to injury, her non-apology was unhelpful and frankly not enough:

The Kennedys have been much on my mind the last days because of Senator Kennedy.  I regret that if my referencing that moment of trauma for our entire nation and in particular the Kennedy family was in any way offensive. I certainly had no intention of that whatsoever.