A Cairo court on Wednesday sentenced prominent political activist Sanaa Seif to six months in prison for “insulting the judiciary,” local media reported.
The verdict may be appealed, although 21-year-old Seif has said she will not contest it.
In a Facebook post, Seif said she did not attend Wednesday's hearing but was going to hand herself in.
"Simply, I do not have the energy to deal with their measures," she wrote.
Seif, who is currently out on bail did not attend Wednesday's court session, state-run daily Al-Ahram reported on its website.
She was accused of inciting protests against the Egyptian-Saudi Red Sea island deal in April and distributing posters to citizens in Cairo's Mokattam suburb.
Seif described the investigations as a "farce" which the prosecution considered an insult to the investigators, Al-Ahram reported.
She was arraigned after being caught up in a renewed crackdown on secular dissidents who urged the protests against Egypt's president Abdel Fattah al-Sisi for handing over two islands to Saudi Arabia.
Scores of people were arrested across the country over the past two weeks at protests against Egypt's decision to acknowledge Saudi Arabia's sovereignty over the two Red Sea islands of Tiran and Sanafir.
Seif was pardoned last October after spending 15 months in prison over a 2014 protest outside the presidential palace in Cairo.
She is the daughter of prominent late human rights advocate and lawyer Ahmed Seif El-Islam, and sister of human rights advocate Mona Seif and leading activist and blogger Alaa Abdel-Fattah.
He was imprisoned in February 2015 for violating a law banning unauthorised protests in Egypt. Seif was jailed for taking part in a 2014 rally calling for the repeal of the protest law.
Sisi, a former army chief elected president after overthrowing his Islamist predecessor Mohammed Morsi in 2013, is accused by activists of installing a heavy-handed authoritarian regime that quashes dissent.
