In truth, Elaine did not know who Carmen was.
She did not even know what Carmen’s name was or where she came from at all.
The reason why Elaine said that Carmen was Charlie’s aunt was simply because she was talking nonsense and making up stories.
The reason why she was saying this was entirely because Donald’s words had already scared her completely.
Elaine was afraid that Donald would really kill her. So, she thought to herself, ‘Since Donald wants to kill one of Charlie’s immediate family