Korobeynikova was 7th at the 2012 Russian Championships. Since four skaters above her were age-ineligible, she was named in the Russian team to the European Championships. Initially, there were concerns that she would not receive her visa in time and would have to be replaced by Sofia Biryukova. Korobeynikova made her senior international debut at the 2012 European Championships. She qualified for the short program by winning the preliminary round with a free program containing seven triple jumps, including a triple flip-triple toe combination. Korobeynikova placed 12th in the short program but was ranked 2nd in the long program. She received the highest TES score in the ladies' free skating segment – six points higher than the next best, gold medalist Carolina Kostner – after completing another program with seven triple jumps, including the triple flip-triple toe combination. She was awarded a small silver medal for the free skating segment. Korobeynikova finished in 4th place overall, off the podium by 1.8 points. She placed the highest of the three Russian ladies at the event, finishing ahead of Ksenia Makarova and Alena Leonova. Korobeynikova finished 19th at the 2012 World Championships.