|7.13 The Slice Girls
Madeline is a leader of the Amazons.
After a one night stand with Dean, Lydia gives birth to Emma. Within a day the child is the equivalent of an eight year old, and Lydia hands her over to Madeline for training. Madeline takes her to a building where she is indoctrinated into the Amazon ways with other young girls.
By the time Sam and Dean return to the building where the Amazons were based, they have disappeared.