Christa Pike left a hospital this week after surviving an execution attempt in Tennessee.
Pike, 50, was convicted in 1995 for the murder of a classmate.
The state tried to execute her late last month using pentobarbital.
Prison officials administered two doses of the lethal drug.
Both doses failed to cause death as intended.
Medical staff then transferred Pike to a nearby hospital for observation.
She was discharged after several days of treatment and monitoring.
The incident has renewed debate over capital punishment methods.
Legal experts question how such an outcome could occur with modern protocols.
State officials have not yet announced their next steps in the case.
Pike remains under the original sentence of death by lethal injection.
Her attorneys have filed a motion to halt any further execution attempts.
The case now moves to a federal appeals court for review.
