The singer's trial date has been set for December 23, they said, on charges of "harming the public interest".
The announcement came after the Musicians Syndicate in Egypt said it would bar her from performing in the country after she made the remark at a concert in the United Arab Emirates.
Social media users had shared a video of a fan asking her to sing her tune "Have you drunk from the Nile".
Her comments, the Musicians Syndicate said in a statement, constituted "unjustified ridicule toward our dear Egypt".
The population of the vast country is mostly centred on the banks of the Nile, which flows from the south to the Mediterranean Sea.
Later, Abdel Wahab posted on Facebook that the concert had taken place more than a year ago.
"I don't recall saying that because of course I don't mean it, and it doesn't reflect my personal feelings towards my nation... I'm sorry," she said.
She was also a judge on the Arabic version of the popular talent show The Voice.
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