I remember where I read about her! It was in Silvia Browne's book 'Phenomenon.' I'd recommend looking up Silvia if you haven't heard of her. She's amazing.
Anyway, this is what it says about Lilith in this book:
"Jweish folklore defines Lilith as the first wife of Adam, made of dust exactly as Adam was. When she refused to be submissive to him, she was banished from the Garden of Eden, and Adam was given Eve, who wa created from Adam's rib to guarantee obedience to Adam's will.
When she was cast out of the Garden od Eden, Lilith took up residence in a cave, where she set up her favourite belongings, most particularly a mirror that she proudly displayed. She entertained demons in her cave, the legend goes, and gave birth to legions of demon offspring who emerged from that cave to spread insidious evil throughout the world. It was said that whenever these devil progeny wanted to return to their mother all they had to do was enter the nearest mirror, since by then, through Lilith's powerful vanity, all mirrors had become direct passageways to Lillith's cave.
In some translations of the Bible there is one (and only one) reference to the name "Lilith," in Isaiah 34:14: "And wild beasts shall meet with hyenas, the satyr shall cry to his fellow; and there shall repose Lilith and find her a place of rest." This is believed by some to be the "perios at the end of the sentance" that starts in the Kabbala an its description of the Holy One destroying "the Wicked Rome" and reducing it to ruins "for all eternity. He will send Lillith there and let her dwell in that ruin for she is the ruination of the world."
Now, I'm no feminist, but it hasn't escaped my notice that the most hideous possible interpretations of the Lilith folklore began springing up right around the same time concept of Azna, the Mother God, began fading from church documents, and religion itself became a patriarchy. Maybe it's just me, but respectful as I am tword everyone's beliefs on a large scale, provided they begin with a basic premis of the sanctity of all living things, I detect a certain lack of restraint and objectivity in a statement that reads "for she is the ruination of the world," no matter who this particular "she" is referring to.
In fact, Lilith is a great, positive, highly misunderstood power, the ruler of the first level of the Underworld. And let me quickly add that, contrary to popular belief, the Underworld has nothing to do with evil. You'll find a full description of it in it's own section, (I'll type that up too if you ask me) so I won't belabor it here, except as it applies to Lilith herself. The first of the Seven Lower Levels of Creation, as they're called is home to wonderful, mystical beings, beings that are often conveniently dismissed as delusions- the elves, the leprechauns, the sprites, the fairies, and the Gnomes. Lilith, Queen of the Fairies is the governess of that magical domain.
The entities on the first of these Lower Levels, including Lilith, are on the same frequency as earth itself, which is why "the little people" are seen even more oftan than in the spirit world, if those who see them would just admit it. And believe me, until I began researching this marvelous creation called the Underworld, I didn't buy it either, and might never have bothered to look into it untill I saw a fairy in Ireland with my own eyes and couldn't blink her away as imaginary, no matter how hard I tried. Their life spand average hundreds of years, and Lilith is said to be 4,500 years old. Her power allows her to travel with ease from the Frist Level to Earth to the Other Side if she chooses to. Neither she nor the other First Level beings ever reincarnate- they're a seperate, independant phylum, with no need to advance, but they're every bit as valued a creation of God's as we are.
For practical purposes here on earth, we can use Lilith as one of our most valuable untapped resources. She is loving, vigilant, and formidible protector of our children and animlas and eager to help when they're in touble or missing if we just call on her. She is, however, a force, a brilliant champion of ours with an undeserved mythical reputation for evil, and for bearing legions of the devil's children, and for being so contrary that she was banished from the Garden of Eden, and for being the ruination of thw world- which, when you stand back and take a long, objective look, hints at widespread aknowlegement that, tabloid headlines aside, there's nothing mythical about the power, the impact and the very exsistance of Lilith herself."
So, what do you think? Is she awesome or what?
By the way, I just laughed so hard because as I was typing this from my book, my mom was sitting on the couch opposite me and I just happened to catch a little bit of the movie she was watching. It was about a succubus, named Lillith! 
:
] Looking at that triangle, it appears to me that Lilith just didn't appeal to patriarchal religious writers and so was painted with rather a tarry brush. A free thinking woman replaced by one that they could then pin the idea of Original Sin on. Lilith would be a good place for those to start who were focused on Christian Mysticism, IMO.
