What if the dragon is Abi's mother who was cursed by a witch? And that's why she seems to remember Alex but he doesn't remember her because she wasn't in her human form. Thus, making Abi's mother immortal because she still had some of the curse in her. And Abi is an immortal as well or something similar in order to stay by her mother's side and the tumor in Abi was in order to repress her memories. 👀