The charge of subversion carries up to 20 years in prison. She was arrested Friday morning.
Makawa said lawyers has told them that O'Donovan would likely have to spend the night in the police cells at Harare Central Police Station and may appear in court Saturday.
O'Donovan is now detained at The Harare Central Police station.
According to court documents released by the group Zimbabwe Lawyers for Human Rights, CNN reported that Zimbabwe authorities traced a tweet which said "we are being led by a selfish & sick man" and suggested Mugabe wore a catheter to O'Donovan's IP address.
It was the first arrest in Zimbabwe since Mugabe established a Cyber Security Ministry, in an ominous sign of the country's intensifying crackdown on activism and freedom of speech. He added that his client had formally been charged with insulting the president.
The 25-year-old has called the allegations "baseless and malicious" in a statement.
Police arrested and charged Donavan with subversion for allegedly insulting President Robert Mugabe on Twitter as a "sick man", lawyers said Friday.
Davey Martinez is Nationals' pick for manager
He has been working as the bench coach for skipper Joe Maddon with the Chicago Cubs and, before that, the Tampa Bay Rays . A formal announcement isn't likely to come until Monday at the earliest, possibly not until after the World Series ends.
O'Donovan, an alum of NYU's Gallatin School of Individualized Study, has been in Zimbabwe for a year working as a project officer for satirical outlet Magamba TV and a bartender at local watering hole, Mars Bar.
The offending tweet allegedly referred to a "goblin whose wife and step-son bought a Rolls-Royce".
The alleged tweet follows online reports that Mugabe's two sons, Robert Jr and Chatunga, have imported at least one luxury vehicle from neighboring South Africa.
It was the first arrest made since Mugabe last month appointed a minister for cybersecurity, the Zimbabwe Lawyers for Human Rights said, a move criticized by activists as aimed at clamping down on social media users.
According to CNN, O'Donovan will remain in custody over the weekend while Zimbabwe's highest court considers her bail application.
Social media posts played a major role in fueling major anti-government protests in Zimbabwe previous year.
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