My 7 month old kitten caught a bird! Help?

My kitten just caught a bird in my backyard!

My mom insists that I should give in to my kitten’s cries to venture in my backyard and believes that I should let her stay outside during the day. But i’m scared that my kitten will get hurt or lost and I don’t want her to become wild. I want her to be a house cat.
My mom and I constantly get into fights about this issue. The problem is: when I go to school, my mom lets my kitten outside. And today she caught a bird! She’s becoming wild.
What should I do?
- Suzy