This morning I went to feed my flock and found one of them just laying on the ground, I thought she was dead then noticed she was barely breathing. Blood coming from her vent and some "stuff" hanging out! She was totally fine last night. I separated her from the other birds. I also have one BR rooster, could he have attacked her? I am new to raising chickens and I really don't know what to do! Should I put her down, she really looks like she is suffering. Any thoughts would be helpful! Thank you so much.