She was a cruel child but that really wasn't her fault. If there was blame, it could be placed on billions of years of evolutionary competition.
When she found the nest it became her toy. She took pleasure in destroying the insect's habitat, burning them, crushing them and inflicting other tortures that she devised. What did it matter? It's not like they were people.
When she heard her mother's call, she left her plaything behind. But before she did so she carefully marked the Earth's location so that she could come back and play again.