Would I have shown mercy if I was Ameneh Bahrami

Yes. I would show mercy to the attacker. This is because there is no point for me to cause another person to get blinded. For a blind person, the toughness of being unable to see the world and the things happening around 1 is horrible. For a person who have already experienced such horror, there would not be a need for another person to experience such treatment. Eye-for-an-eye justice may seem as something deserving for one who have done misdeeds. However, the fear if known that 1, in this case, is going to get blinded should have been more terrifying then knowing that he/she is blind. Thus the meaning eye-for-an-eye doesn't really apply in the first place!