I'm not sure exactly where the meet and greet will be, but she'll also be part of a new show called
Tiana’s Showboat Jubilee that will run Oct. 26 - Jan. 3. Here's how the Los Angeles Times describes it:
Tied to the upcoming “The Princess and the Frog” hand-drawn animated movie, Tiana’s Showboat Jubilee will feature a procession of jazzy musicians and performers parading through New Orleans Square at
Disneyland and Frontierland at Disney World.
As the “second-line” procession reaches the Rivers of America dock, a group of pre-selected theme park visitors will board the waiting riverboat (the Mark Twain at Disneyland and the Liberty Belle at Disney World) where Princess Tiana and other “The Princess and the Frog” characters will greet them.
After departing, the riverboat will stop along the riverfront for a performance including songs from the film. The show will be repeated several times a day, with viewing areas along the waterfront.
The article also has a very nice close up shot of Tiana. You can see it here:
http://travel.latimes.com/daily-deal-blog/index.php/tianas-showboat-jubi-5067/