I have seen two of her shows in galleries and they were both significantly different; plus what I have seen on the web. Without a doubt she seems to have acres upon acres of great work. Methinks that we have only scratched the surface of her photographic estate...... Can't wait until the caretakers of her work release more.
I know of one person who bought 30-40 negatives of Vivian Maier from the original person who purchased the unprocessed negs and negatives.
I think there were many images sold online.