Assistance In Literature Location

Helping people find books based on descriptions, possibly vague. I'll start.

If I can brag for a moment, then I'm slightly proud of my book-finding skills. Last month, I found a book that I had been searching for for years by looking up a few key words. Earlier, I rediscovered a different book by typing in a partial quote from a review. When I was at the library today, I found a book that I think I've read before. If I remember correctly (and I don't think I do), I read it on a trip with my religious school.

The same day, I read a book about a teenage girl in a writing class. She starts a blog and strikes up a friendship with one of the commenters. After many months of joking R Ping, she discovers that the R Per is not the gender they said they were and gets uncomfortable. (Part of the R Ping involved a fantasy story where they were nude, for some reason. I think it involved a river and hygiene.) I can't find the book, despite many different searches. Can you help?

I think you want You Know That Show.

I was afraid someone would say that.