At the end of ep345(the anime version), after Vermouth was shot by Akai and took conan as a hostage, she sat in the phone booth and called Gin. I remember her saying "if i knew it'd be a tie between me and Akai, I would've killed him in NY." It sounded like she had a choice. Or maybe it's a problem with the translation. And in the anime, when she encountered Akai, she had a gun and she could've shot him, but she fled instead. And that happened before she met Shinichi and Ran ... So I was confused why she didn't just kill him. She knew he was gonna be a threat to the organisation and she knew she was on a mission to kill him.