The 47-year-old, mother of two, was on her way to the church to attend the midnight mass when she was attacked.
A woman from Kerala's Kannur is battling for life at a hospital in Mangaluru after a man dressed as Santa Claus threw acid on her on Christmas eve.
The attack left the woman blinded, Press Trust of India reported on Monday.
The 47-year-old, mother of two, was on her way to the church to attend the midnight mass in Kannur on December 24 when she was attacked. She was accompanied by her parents and two sons. Her younger son, 7, who was in her arms at the time also received burn injuries and is in the Intensive Care Unit of the hospital.
The police have arrested one person who is believed to be the attacker. The man was reportedly known to the woman and allegedly attacked her after she spurned his advances.