Malik said in the case of an umm walad who injured someone, "Theblood-money of that injury is the responsibility of her master fromhis property, unless the blood-money of the injury is greater than thevalue of the umm walad. Her master does not have to pay more than hervalue. That is because when the master of a slave or slave-girlsurrenders his slave or slave-girl for an injury which one of them hasdone, he does not owe any more than that, even if the blood-money isgreater. As the master of the umm walad cannot surrender her becauseof the precedent of the sunna, when he pays her price, it is as if hehad surrendered her. He does not have to pay more than that. This isthe best of what I have heard about the matter. The master is notobliged to assume responsibility for more than an umm walad's valuebecause of her criminal action."
USC-MSA web (English) reference: Book 40, Hadith 8