Tatarsky, a supporter of Russia’s invasion of Ukraine whose real name was Maxim Fomin, was killed on Sunday in a cafe where he was scheduled to give a speech.
The Investigative Committee on Major Crimes said it had charged Daria Trepova with “a terrorist act in favor of an organized group causing premeditated murder”. The maximum penalty for these charges is 20 years in prison.
It added that the suspect carried out the instructions of people working for Ukraine.
Russia’s health ministry said 40 more people were injured in the blast and 25 were receiving treatment in hospital by Tuesday morning.
Trepova was transferred from St Petersburg to Moscow, where prosecutors are set to ask the Basmanny District Court for her remand.
Footage from the event, which was scheduled to take place in St. Petersburg, showed Tatarsky showing off a statue of himself brought to him by Trepova. The statue exploded shortly after Tatarsky received it.
Russia’s National Counter-Terrorism Committee on Monday accused Ukraine’s secret services of masterminding the bombing with the help of supporters of imprisoned Russian opposition leader Alexei Navalny, a possible hint that Trepova was once registered in an anti-Kremlin voting tactic promoted by Navalny’s movement. An aide to the Ukrainian president said the attack was the result of an internal conflict in Russia.
Court documents indicated that authorities arrested Trepova during a protest on February 24 last year, the day Russia sent its armed forces into Ukraine.
Tatarsky himself has been involved in hostilities with separatist forces in Ukraine in the past.