Mrs. Poe's fate (The end)
After doing a quick browse of the subreddit, I see that nobody has brought this up yet, so I thought I'd be the first.
During a rewatch with my cousin, she wanted to pause and read the newspaper that pops up during the finale, whilst Lemony is talking to the viewers in the soda shop. The front page reads "OUR LAST EDITION: Daily Punctilio shut down for false reporting!" The picture shows Mrs. Poe behind bars, with a blurb on the left reading: "How does one determine that a great editor in chief decided to run a stunt that was clearly false, a simple answer cannot be determined with any certainty." Beneath her picture, a larger text reads, "We currently have no information regarding where the Baudelaire orphans and Count Omar correction Count Olaf are."
The back of the paper reads several small pictures about the Hotel Denouement, an advertisement for Sarsaparilla, a picture reading La Forza del Destino (by Gisueppe Verdi, mentioned briefly in the show), Last Chance Convenience Store. The most interesting square I noticed though was in the very top left corner, it says "Sunny Trail, Chewy Granola Bar." I wonder if with the Baudelaire fortune, Sunny was able to open up a granola factory or something? It doesn't seem in character or make sense for her to make granola specifically, but her making food in her future aligns with her chef abilities.
Anyway, I mostly made this post to point out the confirmed fate of Mrs. Poe. Jailed. Unfortunate for her kids. Their mom isn't dead, but they are functionally orphans.