Ready for a new substep?

My student read all 15 nonsense words without tapping today so I am making the judgement that she is ready for the next substep.  Knowing when to progress is feeling a bit nebulous but I believe she is ready for a challenge.  Today's lesson went well until I had to correct her for rearranging the magnetic letters.  That felt really silly and fussy to me but it is the Wilson way.  I explained that tomorrow the reason for the set up will become apparent.  I felt like I lost her a little bit after that but I HOPE we ended on a good note.  Certainly she wished me a good day when she left and seemed happy to see me at recess and at dismissal time.  I messed up the sight word instruction today.  I need to practice that part a bit more to become fluent with it.  I liked the way part 8 went today.  After doing the dictation part we revisited the sentences - doing proofreading and then marking up the digraphs.  I felt like that was more lesson like.  Still lots to learn.  We also attacked when to use ck today - that went well!  So, on to substep 1.4 tomorrow and teaching about bonus letters!