>>54646198she'd have to be Nerissa basically. As it so happens she seems to have 0.0% resemblance to Nerissa activity/statement wise, Nina herself hasn't given such hints and none of the snoops/tweet analyst detectives think it's her.
We can tell Nerissa is supposed to feature as a singer, that much is for sure. Could Nina even sing? I don't recall ever even hearing that about her. Would Nina want to be an idol? That's a redundant question, the answer is no.