What can I do????

I am sitting here crying. This is crazy. My cat makes me crazy! She was crying at the door and I looked out and she had a bird in her mouth! I yelled "no". Then I heard her messing with it and chasing it around the deck... which meant it was still alive. I paced about 15 seconds and thought "heck no!" I looked out and she was laying there while the bird was on it's back panting and it's foot moving. It was still alive. So I opened the door and it flipped over and hopped off the deck! But Punkin hopped after it!!!! I called her.... she didn't listen. I watched the bird try to fly away... punkin stopping it. It hopped across the street... punkin was ruthless.... only letting it get so far. Meanwhile this crazy lady (me) is in her nightgown yelling and calling for her cat. Birds are dive bombing punkin trying to save their friend or family member. I run in the house and got the bag of catfood. The bird hopped in the bushes.... I started shaking the bag. It worked!!!! She came running to the deck and I got her inside. I am shaking, upset, and hoping that bird will live. I know it is punkin's instinct but i hate it. I want to put a bell on her.... but after watching our one cat hanging from our chainlink fence years ago (Sissy lived) I hate to put collars on cats. What to do.....