She was arrested in May before departing from Cairo Airport.
The court's verdict is not final and will be appealed on 29 July.
Emad Kamal, Mazbouh's lawyer, has expressed that "with all due respect to the judiciary, this is a severe ruling".
The court reduced the penalty from 11 to 8 years in prison, further imposing a fine of EGP 10,700.
Mona's lawyer Imad Kamal said that ten years ago she underwent brain surgery, then it's hard for her to cope with anger. She said she faced verbal harassment, launching a scathing attack at the bank's employees, which then prompted the bank to file a lawsuit against her.
In June, Egypt's parliament approved a bill placing social media accounts, blogs and websites with more than 5,000 followers under the supervision of the country's top media regulatory body.
Police speak to Amesbury victim Charlie Rowley
Britain has notified the global chemical weapons watchdog, the Organisation for the Prohibition of Chemical Weapons (OPCW). The poisoning of the Skripals was the first known offensive use of such a chemical weapon in Europe since World War Two.
Croatia beats Russian Federation in shootout to reach semis
Modic will have to show leadership in Sochi if Croatia is to make it to the semi-finals for the second time in their history. Host Russia are set to face Croatia later today in the quarter finals of the world cup at the Fisht Stadium in Sochi .
How to watch the semi-finals
I pray and I would give anything in the world that this squad eventually "confines us to history". We want those who are 100-per-cent match fit.
Zsa Zsa, the World's Ugliest Dog, dies at age 9
It was attended by Brainard, her husband and their one-year-old daughter, Mareslie. "We were all saying our goodbyes". The canine won the hearts of people with her slobbery tongue, squished-in face and sparkly pink collar.
May loyalist named UK's new foreign secretary
Brexit minister Steve Baker and unpaid parliamentary aides Conor Burns and Chris Green also resigned. May was forced to reshuffle her cabinet after Boris Johnson put in his papers on Monday.
Pogba urges France to avenge Euros defeat
England's John Stones and Jesse Lingard celebrate after their win over Sweden in Samara, Russia on July 7, 2018. He's ready to face the music now and says "it's nice to hear people enjoying it again".