British police officers investigating the death of Harry Dunn will interview the suspect under caution in the US.
Anne Sacoolas left the UK and claimed diplomatic immunity after being involved a car crash that killed the 19-year-old outside an US spy base in Northampton on 27 August.
She has now requested that she be interviewed under caution by Northamptonshire Police officers in her home country, and they will travel there shortly.
Chief Constable Nick Adderley said: "The suspect has cooperated fully with police and authorities and requested to be interviewed under caution in the US.
"She did not want to provide a pre-prepared statement, as is her right."
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Being interviewed under caution means Mrs Sacoolas will have the right not to answer questions if she does not want to – but anything she does say can be used in a legal case.
During what he admitted was a "fairly unprecedented" press conference for this stage of an investigation, Mr Adderley said officers had worked "tirelessly" on the case since the accident.
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He said that Mrs Sacoolas not being in the country "frustrates the investigation, but does not stop it", and that police had now passed the case on to the Crown Prosecution Service.
He added: "The suspect cooperated with police at the scene and spoke with authorities there. Officers attended the home address of the suspect next day (28 August), and again she fully cooperated."
Mrs Sacoolas, 43, has offered an apology over the fatal crash outside RAF Croughton, but has been told by Harry's mother Charlotte Charles that "sorry doesn't cut it".
Mr Adderley said Mrs Charles and Harry's father Tim Dunn had acted with "dignity and grace" since the accident, but warned family spokesman Radd Seiger to "exercise restraint in his commentary".
He said he understood the "emotion and anxiety" caused by the case, but added: "I urge him to exercise restraint in his commentary as it is not helpful."
Mr Seiger has regularly spoken of the family's disappointment with how the case has been handled by the UK and US governments and was critical of a statement given by Foreign Secretary Dominic Rabb on Monday.
Mr Raab revealed that the US had warned Britain they would remove Mrs Sacoolas from the UK, and that police could do nothing to stop her from leaving.
He said the government position was that Mrs Sacoolas' immunity ended when she left the UK.
Mr Seiger said of the statement: "We are not able to believe everything he says and take it at face value."
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