Mairead Philpott tells prosecutor Richard Latham QC that it is "possible" her husband Mick got out of bed to light the fire.
She agrees with him that there was no mention of this in her defence case statement.
Mr Latham asks why she would say nothing of this in her interview if she was innocent. Mairead says she was following advice.
More top news
At least one person has died in the crash after the plane came down in the city of Riverside shortly after take off.
The animal is believed to have been attacked with metal bars, knives and rocks and later died of his injuries.
More than 20,000 allegations of abuse by care home workers have been made in the last three years, figures show.