In this instance, Gwen is actually very much aware that she would not have known about Jack's immortality if she hadn't witnessed it for herself. She hasn't said anything to the others primarily because she assumes that Jack wouldn't tell them anymore than he would have willingly told her. Her superiority complex has always frustrated me. In this AU, though, it's less to do with any sense of superiority as it is to do with plain and simple miscommunication - and Gwen's unfortunate propensity to make assumptions without the broader perspective. Everyone (read: Jack, Ianto, Gwen) will be at least partially responsible for Gwen's misunderstandings and errors.
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Everyone (read: Jack, Ianto, Gwen) will be at least partially responsible for Gwen's misunderstandings and errors.