The First Lady said her husband was given medicine intravenously and couldn’t rise from his bed.
“He spent two weeks experiencing diarrhoea but we never made a noise about it,” she said, in comments carried by NewZimbabwe.com.
Mugabe even summoned cabinet minister Sydney Sekeramayi, a Swedish-trained medical doctor because he felt he was on his deathbed, Grace said, speaking in Shona at a Zanu-PF rally on Saturday.
“My husband asked me to call Sekeramayi to come and see him before he died and I called Sekeramayi who entered his bedroom when he was hardly able to wake up from his bed,” she said, without giving a specific date for the incident.
She added: “My husband went through food poisoning for sure… but he never went publicly about it.”
The revelation at the rally in the northern town of Bindura was a jibe at Vice President Emmerson Mnangagwa, whose allies claimed he was deliberately poisoned by political foes at a similar rally in August.
Mnangagwa’s faction is said to be opposed by one aligned to the First Lady.
The revelation that Sekeramayi was summoned by Mugabe at a time of severe ill-health will likely fuel speculation that the quietly-spoken politician was favoured to succeed Mugabe.
But on Saturday Mugabe ruled out choosing a successor, saying it would be against the party’s constitution.
At 93, Mugabe’s health is a source of constant speculation. The president makes regular trips to Singapore for health check-ups, though officials say these are specifically related to his eyes.