The nature of her appearances during the holiday season still isn't clear.
Here's a comment to the blog post referenced above:
Will Elena be available for pictures and autograph?
...
Yes, she will be!
Erin Glover on September 13, 2016 at 1:35 pm
However, it is now known that "Princess Elena's Musical Grand Arrival" will be at 12:35 PM, 1:50 PM, 3:35 PM, and 4:50 PM daily.
That appears to leave precious little time - perhaps a set or two in the morning - for her to meet guests.