I've been using the All About Reading Pre-Reading program with my 4yo. We've gone through the first section on capital letters and she was doing awesome. Then, as we hit the last five or so letters, she's suddenly getting mixed up (I/Y, W/M/N, U/Q). It's understandable since the letters have a visual or audible similarity. Any tips on helping her remember them? She's very determined to move on to lowercase but I don't wan't to rush into it before she has a firm grasp on uppercase.