As per Wikipedia article on Satyabhama:
Satyabhama is the third consort of the God Krishna, the eighth avatar of the god Vishnu. Satyabhama is believed to be an avatar of Bhumī Devī, the Goddess of Earth who is Prakriti form of Mahalakshmi. She aided Krishna in defeating the demon Narakasura.
Wikipedia mentions satyabhama has incarnation of bhumi devi but I haven't found any such reference in scriptures.Please do provide reference.