My post got removed thanks for keeping the spirit alive hehehe!Perhaps it would be different if only a couple birds were killed, but from my understanding, she lost over a dozen birds. : (
While my dogs have never hurt my birds, I know I would be absolutely sick if they did. Given the situation, I think she made the best decision for herself, the future safety of her flock, and the dog.
I agree with what @tropical said, while rehoming the dog sucks, on top of an already terrible situation, she deserves to go to a loving home without birds, and FBM deserves to continue raising birds without fear of another attack.