What should a woman who deliberately aborts her foetus do (to expiate for her sin)?
Question

                you will be able to answer my question. I would like to know, besides repenting to Allah, is there a certain punishment a sister in Islam should receive for having an Abortion? And,if so, who carries out the punishment?
Praise be to Allah.She has to repent for deliberately 
          aborting her pregnanacy after it had been created, because aborting 
          it is haraam and is not allowed. Once pregnancy is known, it has to 
          be protected and it is haraam for the mother to harm it in any way, 
          because it is a trust which Allaah has placed in her womb, and it has 
          rights. So it is not permitted to treat it badly or to abort it.
Shaykh al-Fawzaan said: if the soul has 
          been breathed into the foetus and it has started to move, then the woman 
          aborts it after that and it dies, then she is considered to have killed 
          a soul and she is obliged to offer the kafaarah (expiation), which is 
          freeing a slave.  If she cannot do that, then she has to fast for 
          two consecutive months and repent to Allaah. That is if the pregnancy 
          was over four months, because in that case the soul has been breathed 
          into it. So if she aborts it after that time, then she has to offer 
          kafaarah as we have menioned. This is a serious matter and it is not 
          permissible to take it lightly. And Allaah knows best.
        See al-Fataawa al-Jaami’ah li’l-Mar’ah 
        al-Muslimah, 3/1052