Thank you for detailed reply i got directly information from USCIS and they confirmed that the person can live for no more than 364 days. But he/she need to give the reason on arrival which could be anything like medical condition etc.
My mother received her Green Card in March 2022 and then travelled back to Pakistan in May 2022. Since then, she is in Pakistan. I wonder how long she can further stay in Pakistan. is it 12 months?