Many early readers go into hiding once they figure out that what they do is unusual.
That is interesting because I'm not sure how well my dd can read because she does stuff in "secret". Even putting puzzles together is done when no one was looking. A couple of weeks ago, I showed her some fractions on her computer math game and she waited until I left and thought I wasn't looking until she did them on her own and correctly. Fractions like 3/5 and 2/7 (matching the fraction with the baked good that represents the fraction).
She did read the word "again" in a brand new book while we were reading it together several months ago. I think she "slipped"!! LOL
