Rohonyan won the Women's Ukrainian Chess Championship in 2000 in her hometown, Mykolaiv. She competed in the Women's World Chess Championship 2008 in Nalchik, Russia, where she defeated Natalia Zhukova in the first round to progress to the second, losing to Inna Gaponenko. In 2010, she tied for the first place in the Paul Keres Memorial Tournament in Vancouver, British Columbia, Canada.