The Tennessee correction department said Pike had been taken to an off-site medical facility, while one of her lawyers said on Wednesday that she was being given “life-saving measures” in hospital.
On Thursday, lawyer Randy Spivey told reporters: “We don’t have a sense of her prognosis or much update on her health at the moment.”
Dr Joel Zivot, a professor at the Emory University School of Medicine, told the BBC in an email: “It’s very possible that as a consequence of the delay of the beginning of resuscitation she [Pike] will have a brain injury.”
Pike’s lawyers are now asking for her sentence to be commuted, but it is not clear what might happens next.
Historically, the US Supreme Court has not halted second attempts at executions, said John Mills, a lawyer who works with inmates sentenced to death.
In 2024, it allowed Alabama to proceed with a second execution of Kenneth Eugene Smith, using an experimental oxygen deprivation method, after their attempt to kill him by lethal injection failed two years earlier.
