Despite Cecilia never showing any malice, Bai Fu's guard was fully up.
Who could blame her when her Affinity was always in the single digits, and she was from the Stone Crystal Company?
Others might not be aware of the grudge between Bai Fu and the Stone Crystal Company, but how could Bai Fu herself be unclear?
Therefore, after leading Cecilia to her room, Bai Fu hurriedly made an excuse about going to make tea and then sneaked into the kitchen. The moment she was out of Cecilia's sight, she used her Shadow Substitute to turn into a Void Spirit and escape, and as the illusion was about to dissipate, she urgently summoned Black Fu.
To deal with such a person of unknown origin, it was better to let Black Fu handle it, as even if Black Fu was destroyed, she could be summoned again after 12 hours.