I agree with this. At this point, I don't think free ranging is going to solve your problem. Olive may quit laying due to stress. If it were my flock, I'd get rid of Green immediately - especially if another one is picking up her bad habits. Get her gone before they get ingrained in Black. I...
Personally, I'd eat Green. If you ate Olive, there might be a chance that Green would then target another one. Sometimes a chicken just does not fit well with the flock and needs to be removed.