Lilith refused to lay beneath Adam during sex. She believed they were created equal, both from the dust of the earth, thus she should not have to lay beneath him.
After Adam disagreed, Lilith fled the Garden of Eden to gain her independence. Adam told God that Lilith had left and God sent three angels, Senoi, Sansenoi, and Sammangelof, to retrieve her. The three angels found Lilith in a cave bearing children but Lilith refused to come back to the garden.
https://www2.kenyon.edu/Depts/Religion/Projects/Reln91/Power/lilith.htm