[She hadn't been privy to that bit of information before, and hearing it is a bit of a shock -- and a big concern. She hoped now that Chibiusa had returned to their world, that whatever it was had resolved. But now, now she worried for Mamoru and herself.]
Oh no... I'm glad you were here to help her, Mamo-chan. She must have been frightened. I had no idea she was going through that...
[Off topic or not, it's something that Usagi is glad to know. At least together, they can figure it out. hooray useless crystals!]