# data[].attributes.body
Clara is a future regeneration of River Song who's had her memory erased. River is, after all, a Time Lord. We've seen her regenerate before. In favor: Doctor Who has a proven record of trading in its Time Lords for younger models (see The Master in “Utopia” and, oh, every regeneration of the Doctor).May 3, 2013

is she hybrid?
The Doctor finds the immortal human Ashildr waiting in the ruins of Gallifrey. Ashildr theorizes that the Doctor and Clara together are the Hybrid. Since they are so alike, each pushes the other to potentially catastrophic actions.