In most spiritual followings, She would be considered eternal. In some, She may be as old as the earth itself.
She was born as a goddess
Isis was born a goddess, born of the earth god Geb and the sky goddess Nut.
Isis was born a goddess, the daughter of the earth god Geb and sky goddess Nut.
Isis is considered to be a goddess because in ancient Egyptian religion she was born of the goddess Nut and the earth god Geb.
Nephthys was born a goddess. She is the daughter of Nut the sky goddess and Geb the earth god.
Osiris was born the son of the earth god Geb and the sky goddess Nut.
Isis wasn't actually born, nor did she die. She was an Egyptian goddess.
Kronus and Rhea, who were born from Uranus (sky) and Gaea (earth) who were born from Khaos.
Nox, or Nyx, the Goddess of Night, was extremely ancient. She is a primordial goddess and therefore, it is hard to say exactly where Nyx was born, as she was said to come into existence alonside or even before the Gaia the Earth. Unlike Zeus, who was raised in a specific place (Mt. Ida in Crete), Nyx was not born on the Earth.
Gaea was the goddess of the Earth in Greek Mythology
Hestia is goddess of fire, and as the home/hearth is on earth, also a goddess of it as a granddaughter of Gaea, the Earth personified.
Isis was born by the sky goddess Nut and the earth god Geb.