I was thinking that Ez and Jack might have an unknown association with one of the Black Jacks. After her ordeal with being burned, she pursued the men who did it. The main person behind the attack was a Black Jack that was very ruthless and difficult to track down. She finally located him, but decided after much contemplation, that he was beyond her ability to kill without putting herself in mortal danger. (She tried once, but failed due to his preference for young boys.) My thought is that she hired someone, for a large sum, to find someone to take the man out. That someone would be Jackal. The man, named Diablo, was a difficult one to locate, and all Jack needed was his location, which is what Ezra supplied to him unknowingly through the man she hired.
Also, the hat she wears is made from the skin of the two men she managed to track down and kill herself.
I do not care if Jackal knows she is the one who tracked Diablo down, but she is not aware of who killed the last man on her list for revenge. She isn't even sure the man is dead, although she heard rumors to that affect.
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