Nope...it was to get herself and the kids away from the grip of the Kennedy family, whom she detested and saw as barbarians.
No doubt she correctly assessed who/what the Kennedys were/are.
But, her actions really do reflect a mama bear protecting her cubs. I know that if I were her, after Bobby was killed, I would have feared for the safety of my children. It was reported that she did say “They’re killing Kennedys”, and “they” were.