Question, why did you pull Amy up on her rear legs to your chest? In the act of being Fear Aggressive toward this other dog, she might redirect on you, making a bad situation, worse.
The owner of the bulldog is at fault. How did your dog act after the spaniel was under control? I wonder if getting picked up and smashed against you while you yelled at the spaniel's owner freaked her out worse? Was she trying to get at the other dog at all?