Start with Pandora’s Box (1929) a great silent film in which she plays Lulu. It would certainly be on my list of top ten silent films. The great Criterion Collection two-disc DVD version is out of print. I posted a link to a version on YouTube. I assume it’s in the public domain by now.
She wrote a book that was published in 1982. I also added the review from the New York Times.
Sad! 