(CNN) Emma, a 12-year-old girl, is "fighting for her life" in an Atlanta hospital after testing positive for the coronavirus, according to her cousin.

Justin Anthony told CNN that Emma was diagnosed with pneumonia on March 15 and tested positive for coronavirus on Friday night. As of Saturday, she was on a ventilator and is currently in stable condition, Anthony said.

Emma had no pre-existing conditions. She has not traveled recently and it's unknown how she contracted the virus, according to Anthony.

Children's Healthcare of Atlanta-Scottish Rite Hospital confirmed that a current patient tested positive for Covid-19, though it declined to go into details.

"The patient remains in isolation, and we have consistently used appropriate precautions. Additional details will not be released due to patient privacy laws," said hospital spokeswoman Jessica Pope.