It takes willpower, planning & focus to ask all the right questions while at an expo...It's probably nothing serious, & you don't need to repeat her "physical", but
if you see her out & about, just try to be observant.
It's probably the combination of time of year (expecting to brumate) & the new surroundings that have her freaked out a little. Bear in mind that both temperatures
and the amount of daylight can tip off snakes to brumate. You might try leaving a "daylight" bulb on near her (same room) to may the days seem longer, but if she's
been brumated & bred in the past, she may be hard to fool. If she continues refusing food & is kept at warm temperatures, it might be better to just 'go with the flow'
so she doesn't lose too much weight, & gradually reduce her cage temperatures, reduce the light (cover her cage) & let her sleep a couple months. You didn't mention,
but I assume she isn't skinny? Be sure she has fresh water at all times. When I lived in the desert, I found that I had a bedroom closet on an "outside" wall that was
cool enough (near the floor) to brumate snakes...it was about 55* (under 60*) for long enough to serve the purpose, especially since I only brumated a few at most.
Just a thought: Her activity might just be that she's too warm & is looking for a cooler place to brumate.