Anne Sacoolas admitted she drove down the wrong side of the road before ploughing head-on into teenager Harry Dunn.
The 42-year-old wife of a US spy finally broke her silence over her part in his death, as his distraught family again demanded she fly back to face justice.
Mum-of-three Sacoolas, who sparked fury after fleeing Britain claiming she had diplomatic immunity, gave her account of the smash through her lawyer Amy Jeffress, of US legal firm Arnold & Porter.
They said there was “no dispute” about what happened when Sacoolas hit Harry, 19, near an RAF base.
A statement read: “Anne was driving on the wrong side of the road and is terribly, terribly sorry for that tragic mistake.
"She wants to meet the family to apologise and take res- ponsibility. Anne had no time to react when she saw the motorbike.
“Anne stayed on the scene of the accident to assist. She spoke to Harry to tell him that she would call for help.
“She waved down another car. That driver offered to assist Harry so that Anne could comfort her young children in her car.”
Sacoolas claimed she left the scene only when an ambulance arrived.
Harry’s parents Tim Dunn and Charlotte Charles are in New York campaigning for Sacoolas to appear in court in the UK.
Tearful Charlotte, 44, said: “She must do the right thing to set an example to her children. You can’t run away after something this terrible.
“We shouldn’t be suffering like this. It should have been an open and shut case. The evidence is clear what happened.
“We’ve been told that there is CCTV evidence showing her on the wrong side of the road and you see Harry’s headlight of his motorbike and then there is a big fireball when his bike went up.”
The pair are planning to meet US politicians, possibly even Donald Trump.
Tim, 50 – who is separated from Charlotte – said: “I would say to him [Trump] how could you let this happen?
"If you are a father and your child died surely you’d want that person to own up and take responsibility for their action.”
Harry died after the crash near RAF Croughton, Northants, in August.
Sacoolas’ husband Jonathan works on the base. She said she left the UK around three weeks after the crash.
Harry’s family lawyer Mark Stephens insisted the Foreign Office have “questions to answer” over the case as he believes Sacoolas was never entitled to diplomatic immunity.
He said her claim should have been “tested before the courts”.
But Mr Stephens added: “I believe it’s a cock-up rather than a conspiracy.”
Foreign Secretary Dominic Raab said the American’s immunity is “no longer relevant” as she is back in the US.
