There were no witnesses to the death, of course, or there would have been more than "suspicions". There was also no concrete scientific or objective observational evidence that could tie any particular person to the girl's death. So, what's a free society to do?
Gossip being what it is, most people formed their opinions concerning her guilt or innocence based purely on whether or not they liked the woman, which was based on what other people said about her. Almost without exception, without knowing anything about her from first-hand experience. Yeah, that still happens here and is probably just a part of human nature that won't go away anytime soon simply because it's ridiculous.
Restitution being impossible, and without even definitive evidence of the ZAP being violated or a debt being incurred, the matter dropped. People chose to either shun the woman or not. Those who believed she had killed her daughter refused to deal with her in any way from this day forward. They could refuse to sell her food, or repair her vehicle, or hire her, or anything. Those who felt she was innocent were free to continue to do business with her. In this case that number of supporters is rather small.
However, human nature being what it is, if she gets herself into another fishy situation anytime in the next several decades, her base of supporters would probably be too small to keep her housed, clothed, fed, and fueled. No person is an island and no one is truly independent, as is abundantly clear even in Libertopia. And without The State to meddle, there is no one to save bad people from the just consequences of their actions.