Maybe. And the truth is, I don't like hiding things from Usagi-chan. Not at all.

[And surely telling her would be different from the shock of it happening, or seeing it?]

But I know even when Zoisite targeted the 'princess', Usagi-chan wasn't affected, because she didn't have any idea that was her. Once she does... she might be more vulnerable, to things like that and to the princess.