Nguyen Ngoc Nhu Quynh was convicted in June of spreading propaganda by distorting government policies and defaming the Communist regime.
Lawyer Nguyen Ha Luan says the People's High Court determined after a half-day hearing today that the conviction by the instant court was justified.
Quynh maintained she was innocent throughout the trial, Luan says, adding she admitted to have written the articles, but they did not constitute a crime.
The 37-year-old blogger known by her pen name Me Nam, or Mother Mushroom, co-founded a network of bloggers and is very popular in Vietnam. She has written about human rights and civilian deaths in police custody.