She only has one book on her shelf in total.
OK, that makes it VERY weird that her stats show 2 books found! If she journaled another book anonymously, it shouldn't show in her official stats. If she journaled the 2nd book while logged in, but then deleted the JE for some reason, I'd think the stats would self-adjust (though I may be wrong there). I would imagine she'd remember actively deleting a JE, anyway.
If she made duplicate JEs on the *same* book it might show as 2 books found, but only one JE shows now.
I wonder if there was some site glitch while she was trying to journal the first book back in 2012. The site's supposed to allow an anonymous JE and then offer to let the finder sign up, automatically changing the anonymous JE to an official one with the finder's new screen name - but if something went wrong in the process, it *might* have resulted in the 2-books-found/only-1-on-bookshelf situation - though it seems pretty far-fetched.
So, yeah, something seems screwy with the stats, but what caused it I have no idea.