Borsiova had a successful junior career winning numerous medals including gold medal in hoop at the 2012 Pesaro and 2012 Kiev Junior World Cup. She took silver in clubs at the 2010 Pesaro Junior World Cup. At the 2012 European Junior Championships, Borisova won the gold medals in hoop and with the Russian junior team (Yana Kudryavtseva, Julia Sinitsina and Aleksandra Soldatova).