She said he was chosen by God to lead Zimbabwe.
Grace told scores of Zanu PF supporters including school children in Bureha today that Mugabe (92) is a rare gift from God.
She said there was no presidential vacancy.
"In Zanu PF we have an upper hand, we are blessed but at times we do not realize it.
"We want to discard a rare gift from God.
"We have a gift, an icon leader President Mugabe. That man is irreplaceable. That's the truth. Its from God.
"You are the one who put an X (on the ballot paper) for Mugabe and you don't realize that its God who directs you to do that" she said.
Last year, she said her husband will remain their leader even when he's "in the grave".
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