Reminder: Lin is half elf if you recall or remember and in the flashback of Chestnut she possessed Chestnut’s Other Daughter and manipulate her into poisoning Lilias and making that possessed child the New Ruler. As Long as Elf blood runs through someone then that person can be possessed by Twilight Star. Chestnut’s Husband being secretly an Elf than a vampire
I remember that Lin is half elf, but I was talking about the fact that Twilight Star shape-shifted into Tina, who is a vampire and not a half vampire half elf like Lin