Castle Story 9/3: Wedding of the Centaur-y | event information on page 1

[RonjaR82]

Make sure your tickets are not maxed out at 99. I’ve gotten at least one ticket every collection.

I've only collected from Nia 2 times (I was extremely slow this event), but I've gotten Trade Tickets from her both times.
Could she be a guaranteed Trade Ticket dropper?

My centaurs have take up residence in the Fall Castle (Baron's Tent prize right now)