A mother who misled police after her son caused his friend's death has failed to have her conviction quashed.
Annie Jasper, 50, of Dunstable, Bedfordshire, was given a nine-month suspended prison sentence in November for perverting the course of justice.
She failed to tell officers Christopher Jasper, then 25, had contacted her after the fatal crash in December 2009.
Court of Appeal judges took 10 minutes to dismiss her lawyers' claims of insufficient evidence.
Mr Jasper, then 25, of Kensworth, was jailed for five years in June last year for causing the death of Paul Robinson by dangerous driving.
He had been driving the 26 year old and another friend home from The Glider pub in Dunstable on 27 December when his BMW crashed into a tree.
Rather than wait for police to arrive, Mr Jasper went to his parents' house, before going on to a friend's, the Court of Appeal heard.
He handed himself in to police the next day when an alcohol breath test recorded a reading of zero.
Judge Peter Collier QC said Jasper, of Valence End, had failed to tell a police officer who came to her house that her son had been in contact with her after the crash.
Rejecting the appeal, Judge Collier, sitting with Lord Justice Pitchford and Mr Justice King, said: "The appellant's case and the arguments she advances were all fully represented to the jury.
"The appellant's real complaint is that the jury came to the wrong decision.
"It was, however, in our view, a verdict they were entitled to reach on this evidence."
Christopher Jasper's father, Glen Jasper, then 46, was jailed for nine months at Luton Crown Court in November for perverting the course of justice. He had denied the charge.
His girlfriend, Tanya Cameron, then 25, admitted the charge and was imprisoned for six months.