Natla is a god. She can't die and she is immortal.
And Tomb Raider Legend is a reboot of the game series, the next game Anniversary is a remake of the first game and prequel of Legend, so the time-line stays in the same way Legend is.
They are rebooted the game series again next year with "Tomb Raider" which will focus on Lara's early days, so if they want they could bring Natla back again