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I think that the actual story will be completed and resolved in episode 99, and then episode 100 will be more of a "thank you so much for sticking with all of us, through thick and thin," etc. etc. message.
I had no idea when this first started that I would become so attached to this story and these characters. Whatever they do with episode 100, i'm at least hoping for party hats.
I'm guessing that towards the end we're going to be presented with some reason as to why Lizzie can't continue with the vlogs in-world. Either that will happen in episode 100 - or she'll tell us beforehand and 100 will be like you say - just her saying goodbye.
Either way, it's going to break my heart.
'To love another person is to see the face of God' - Les Miserablés
'There's some good in this world... and it's worth fighting for' - The Lord of the Rings, The Two Towers.
'This is why I love books... they jump into the abyss to be with you.' - John Green