In order to understand who and what Lilith is, one must look at the history of her development. In the 70's, a Yale student (Judith Plaskow, a Jewish woman), wrote "The Coming of Lilith", which examined Lilith from a feminist perspective. This interpretation of Lilith was taken completely out of context, and she was reimagined as a pagan sex goddess of feminism, which just isn't true.
Within Judaism, Lilith began as a category of lesser demon, ones that killed babies and raped men.
The modern view of Lilith comes from a Medieval misinterpretation of Genesis 1 and 2, which thought of them as two parts of one story, when in reality they are two different retellings of one creation myth. In one, it says that both Adam and Eve were created out of dust, and in another it says that Adam was made of dust with Eve being made later out of his rib. People conflated these and assumed that there must have been a "first Eve" created out of dust and then for some reason a "second Eve". Then, we get the Alphabet of Ben Sirach, which was a satirical text that was a comedic commentary on a lot of other ideas and opinions at the time (lots of commentary on flatulence, interestingly enough). Within it, we get the first appearance of Lilith as this "first Eve" and the reason given for a second Eve being created is that Lilith did not obey.
Before the Alphabet, liliths were a category of lesser demon or malicious being, usually one associated with being mischievous wind/night spirit, killing babies at night (usually as an explanation for miscarriages or sudden infant death syndrome), or assaulting men.
Sure, there are pre-Jewish entities that are loosely connected with liliths, appearing in Sumerian/Mesopotamian texts as a category of mischievous wind spirit. So, sure, there are the Sumerian/Mesopotamian "lilitu"/"lilit"/"lil", but that's not going to be a feminist goddess, it's going to be a lesser type of wind spirit.
