Asia Bibi is now hiding because her life is in peril.
They were harvesting fruit when a row broke out about a bucket of water. The women said because she had used a cup, they could no longer touch it, as her faith had made it unclean.
She was later beaten up at her home, with her accusers saying she had confessed to blasphemy. She was arrested after a police investigation.
Hard-line politicians have often backed severe punishments, partly as a way of shoring up their support base.