The sentence you wrote is:
“A mother dingo doesn’t hunt small prey near her den, leaving them to her pups.”
This sentence is grammatically correct! It clearly says that the mother dingo avoids hunting small animals near her home so that her babies can have the chance to catch them. The words and punctuation are all used properly.
If you want, I can help you make the sentence easier to understand for a young child:
“A mother dingo doesn’t catch small animals near her home. She lets her babies catch them instead.”