Distraction fox is working. I repeat distraction fox is working.
Yeah, it's a fox. RPG maker graphics can be a bit meh, I know. Either way, kitsune are mischievous and like to play tricks on others. Ayane is a prime example of this. I'm pretty sure you already know this if you didn't skip all dialogues with her.
When she tells you about the Miko dress for her quest, she also mentions it's a test of wits. This should give players a hint to expect some trickery.
In short, just ignore the furball and check the maps for other clues. There's no secret room, you will find the required dress in a chest inside the zone. But you'll need to follow a certain path or Ada will arrive at the "loop" section and turn to the entrance.