The lady who protected me from the storm as the boat lurched about in the waves... My biological mother, who died on that boat.
Garland, the ruler of Terra, had become wary of the summoners' powers, the ability to call forth Eidolons. In order to make sure his plan of assimilating Gaia would go smoothly, Garland attacked Madain Sari with the Invincible, killing most of the villagers. However, Jane was able to escape, taking her daughter onto a boat and fleeing the burning village, but the rough seas caused by the storm resulted in her death. Luckily, Jane was able to protect her daughter, as Sarah (Garnet) sailed safely to Alexandria to be adopted by the royal family and raised as a princess.
Garnet had difficulty remembering her childhood before the age of six and had forgotten Jane; however as shown by the opening FMV of the game, Garnet remembers her mother, if only vaguely.
Once she has learned the truth of her birth, Garnet sadly laments that the Invincible took everything from her, including Jane and her adoptive mother.
Jane's name is not revealed explicitly during gameplay and can only be discovered on the Eidolon Wall in disc four of the game. The player must form a party with Garnet and visit Lani standing on Eiko's back porch. Upon arriving, Lani will run away.
They must then exit the village and return with anyone except Garnet or Amarant in the party and talk to Lani twice, read the message and go to the Eidolon Wall. They must walk clockwise from the entrance (heading to the right), just past the "!", until a chime is heard. Next the player has to walk counterclockwise back to the entrance, just past the "!" again, repeating this nine times, going back and forth.
Then the player has to read the murals to discover messages from Garnet's father addressing Jane and their daughter.