Amy wanted to have a snappy comeback, she really did, but the longer she spent in the Doctor's presence, the easier it was to forgive him. How could she stay angry at the man she'd believed in her whole life?
Pulling herself out of sentimentality and back to matters at hand, she crossed her arms and fixed the "Angel" with a calculating look. "I still don't believe you are who you say you are," she began, "but you brought me the Doctor, so... thanks."