She stopped pacing when he stopped talking. "What did I say?" she asked. "When I called you?" The way Finn stopped his conversation and shuffled his feet always meant he was keeping something from her. She crossed her arms and made her 'you better tell me now' stance. Finn would know better than to argue and not tell her.
Part of her was screaming at her to just leave it be. Things would be explained sooner or later, but right now, here was Finn. The very person she was thinking about the night before. Why was she arguing with him? Of course, that was the quieter, sensible side of Rachel. Unfortunately (for herself and Finn), her loud, stubborn voice was raging.