 Complete the following phrase:  Kostornaias international debut was in early October 2017, at a 201718 ISU Junior Grand Prix JGP competition in Gdańsk, Poland; ranked first in the short program and second in the free skate, she won the gold medal by a margin of 1.36 points over the silver medalist, her training partner Daria Panenkova. She won silver behind Sofia Samodurova at JGP Italy by a margin of 0.04 points. Her placements qualified her for the 201718 Junior Grand Prix of Figure Skating Final, where she won silver, placing second in the short program and first in the free skate. At the senior level, Kostornaia won bronze at the 