Wife of sage Gautama. She had a relationship with Indra. Gautama cursed her to become a stone until the foot of Rama touched her. Rama redeems her in the Ramayana.
For the story visit
http://www.sushmajee.com/biographies/bio-A/ahalyaa.htm
http://talesfrommythology.blogspot.com/2011/07/ahalyaa-and-indra.html
http://innertraditions.blogspot.com/2009/10/ahalyas-story-parched-earth-pouring.html
http://innertraditions.blogspot.com/2009/10/ahalyas-story-parched-earth-pouring_10.html