Thinking about something..

An illusion created by Olivia to lure you into the Haunted Mansion?

Anyways, if that's how the story is told at the end, then damn. They had no pictures of Olivia.

Does it explain anything about the chair? "Oh Olivia turned into a chair. Here, have her."

I don't recall the chair being explained really. I'm pretty sure it is just that, a chair. At least Steward made it seem that way.