I think also the phony part is somewhat autobiographical. Not that she's calling herself phony in a bad way. She's just saying that "you'll never scare me, because I know you." Also, agree it's a nod to fame.. and the attributes of being famous.
She's being very real about it.
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 I would tell Christine Perfect, "You're Christine f***ing McVie, and don't you forget it!"
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