When Did Dora Rivkina Die?

Se did not died in a concentration camp. She died when she was with some kind of dance team and the troops had came and told them to point out any Jews. At first no one said anything but when the troops threaten to shoot them if they don't, a woman pointed Dora. they captured her and then they tied a rock on her neck and the shot her and the through her body in to a lake. That is where she died, but i don't know when....