Sally Challen has been granted conditional bail as she awaits a new trial for the murder of her husband Richard.
The 65-year-old, from Claygate in Surrey, pleaded guilty to manslaughter but not guilty to murder.
She is facing a fresh murder trial after her conviction was overturned in February and a retrial was ordered in light of new evidence.
Challen was originally convicted of murder at Guildford Crown Court in 2011 for killing her husband in a hammer attack and was jailed for life.
The mother has denied murder on the grounds of diminished responsibility.
Challen appeared by video link while being held at HMP Bronzefield and spoke to confirm her identity and enter her plea.
Mr Justice Edis confirmed on Friday the trial would be transferred to the Old Bailey.
She was supported in court by her sons David and James.
The 65-year-old had been married to Richard Challen, 61, for 31 years.