Within the academy…
While Xin Feng had been staying over at Haru Ato, Xia Fan had been doing what Xin Feng would usually do, which is to sit cross-legged to cultivate. Sitting cross-legged for almost an entire day was something that Xin Feng was commonly seen doing, hence why, with Xia Fan doing that, she didn't seem suspicious to any people around her at all.
Occasionally, Xin Feng would make a telepathic connection with Xia Fan whenever he cultivated, in order to discuss a few plans and ideas with her. He would also take control of her body, but not switch, which he did in order to talk to or to advice the both of his friends, Maeda and Sora Ren. In that mean time, Xia Fan's soul would simply stay idle within Xin Feng's soul core. She would be without a body, because Xin Feng is basically in control over his and hers.