Sireinna

Wait..I think pearl's identity was already revealed. When Garnet and her are in the truth situation something? She said she was the only princess of her kingdom so she joined the jewel box to look for a husband who will follow her to her kingdom. If I'm not mistaken.

Oh yeah, I do remember something like that happened. But they can lie about it right?

If what she said is true, then the organizers are lying. Or maybe they plan to keep adding new members until they find Marianne?

Hmm I think it's a system of theirs? To add new members that way to make it more interesting. Though your claim is also possible.

However, I think Marianne is truly missing or else the crown prince and moon owl wouldn't look too worried. And they wouldn't have made fl to pretend to be 'real marianne' since moon owl already mentioned it before that to make it more mysterious they would've made marianne practice the things she can't do in order to make it harder for the other jewels and viewers to figure out who marianne truly is. And they already had a 'fake marianne' anyway. I think when they found marianne then she will be added as a jewel there then our fl's role will be accomplished.