If it was given time? She'd trust him. Mandalus just put her on edge. For now she wasn't entirely sure if he was the Sora she knew. He could of been a Sora from another universe. But, he knew her and trusted her. She had to show that to same degree.
Tifa followed along side him. Her gaze was fixed forward and narrowed but she did her best not to make him feel like she was angry at him.