Just because your comment was – though accurate and relevant – perhaps implicitly a little dismissive of Sam’s accomplishment in repelling her and seriously wounding her, here’s how she’s described in the books:

But still she was there, who was there before Sauron, and before the first stone of Barad-dûr; and she served none but herself, drinking the blood of Elves and Men, bloated and grown fat with endless brooding on her feasts, weaving webs of shadow; for all living things were her food, and her vomit darkness.