No, she's not. She merely passively avoided the train derailment. She did not actually have any active part in preventing the derailment from happening. And yet, here's the headline and first para of the article:
SYDNEY, Australia (AP) -- Britain's Queen Elizabeth II narrowly escaped disaster in 1970 when a large wooden log was placed on a railroad track in an apparent attempt to derail her train as she traveled across Australia, a retired detective said Wednesday.
Although the story itself is an AP wire story, it's likely that the headline was written by the Times. What the heck is going on there? Are they hiring illiterate idiots now? "Avert" means to turn aside or prevent, not to avoid or escape. This headline is totally misleading! The Queen is not a heroine, she's just the Queen.