Just seen footage of the crash site on TV, looks as though it happened on a blind brow, biker would have had little chance to avoid the collision. I think we use the term 'accident' to differentiate between this sort of event, and incidents caused by deliberate reckless driving, drunk in charge, racing etc.
I do feel quite a bit of sympathy for the lady. She didn't simply 'flee' the country, she had to have had the advice and collusion of senior personnel at that base to get her on a military transport aircraft, maybe even from Washington, bad advice as it turns out. I could quite understand if this had happened in a country like, for example, Iran, but the UK justice system is pretty lenient*, we don't stick folks in jail for 5 years on trumped up charges. She'd likely get a fine and a caution, possibly licence suspension, and it would all have been done and dusted.
* Straying off topic now. An example of British justice. A career criminal named Kenneth Noye, already convicted with involvement in bullion robbery, stabbed an undercover police officer to death, when he found him on his property. He was acquitted, citing self defence. Some time later, he stabbed a young man to death in a road rage incident, then fled to Spain. Eventually, he was extradited, tried and sentenced to life in prison. Except that life does not mean life in the UK, and he has now been released, in his early fit and healthy 70's, to live out his life in comfort on the proceeds of crime that he has stashed away. In a less 'enlightened' country he'd have been strapped to a hospital gurney and given a lethal cocktail of drugs. I don't support the death penalty by the way, I just think he should never have been released.