When Eglė discovers that her beloved is dead , as a punishment for betrayal she turns her children and herself into trees - the sons into strong trees , an oak , an ash and a birch , whereas the daughter was turned into a quaking aspen .
When Eglė discovers that her beloved is dead , as a punishment for betrayal she turns her children and herself into trees . 
 The sons were turned into strong trees , an oak , ash and birch , whereas the daughter was turned into a quaking aspen .