J.S.
From what you're describing, it's a valid question that she was researching. The biggest problem I'm thinking of first off is that she can't foresee the ugly side of Google searches if there aren't strong filters being used.
I might be more concerned ??? (not quite the word, but I would be initiating some stronger parental controls) if she were looking up "Katniss and Peta sex scene" (think fanfic). I do think that it's appropriate to ask her some leading conversational questions. Hopefully she'll bring it up to you, but you do need to discuss safe web browsing with her. The words we choose to search online search engines with matter in the results we get. ;-)