In the 68 kilogram category, Grigorjeva defeated Lithuania's Danute Domikaityte 8:3 in the bronze medal match.
Ukraine's Alla Cherkasova won the gold medal after defeating Adela Hanzlickova (Czech Republic) 11:6 in the final match.
Grigorjeva, who gave birth to a boy last fall, missed the previous European Championship. Furthermore, Grigorjeva competed at lower weight categories before this year's championship.
Grigorjeva has won two bronze medals at world championships, and three gold medals and two silvers at European championships.
Meanwhile Latvian weightlifter Ritvars Suharevs won bronze at the European Weightlifting Championship in Georgia's Batumi on April 10.
Competing in the men's 81 kilograms, the 20-year-old Suharevs lifted 354 kilograms in total.
Suharevs finished first in snatch with 162 kilograms, setting a new European Under-23 record. He also set a new European Under-23 record in clean and jerk with 192 kilograms, placing fifth in clean and jerk and third overall.
Italy's Antonino Pizzolato was crowned the European champion with 356 kilograms (155+201), while Petr Asayonak of Belarus won silver with 355 kilograms (159+196).
Last year, Suharevs was crowned junior world champion in the men's 77 kilograms.
As reported, Latvia's Rebeka Koha won the gold medal at the European Weightlifting Championship on Monday, lifting a total of 221 kilograms in women's 59 kilogram category. Koha lifted 101 kilograms in snatch and 120 kilograms in clean and jerk.