can anyone tell me how she reveals that she was Leo? I don't want it to be super drawn out

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They will find out her true identity much later since she cannot say it because of a curse.
As adults they will even try to kill her, thinking that she is the murderer of 'Prince Leo'.

does she break the curse? or do they figure it out?

I don't remember much but I think they find out first and then, when she manages to remove the curse, she confesses and they celebrate.