She is the Goddess of the Earth, sort of the "Earth's Essence" and sometimes the Earth itself
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Definition of gaea in English English dictionary
The earth, daughter of Chaos, both mother and wife of Uranus (the sky) and Pontus (the sea)
Greek goddess of the earth. She was both mother and wife to Uranus, or Heaven, from whom she was separated by her son Cronus, a Titan. According to Hesiod, she was the mother of all 12 Titans, as well as of the Furies and the Cyclopes (see Cyclops). She may have originated as a mother goddess worshiped in pre-Hellenic Greece before the introduction of the cult of Zeus