Letting Go

I'm sitting here watching my student teacher teach my classes today.  It's not easy.  It's taking all my self control not to jump in and fix the things she's doing wrong (or not quite the way I would do it).  I know this is what I agreed to. I know this is what's best for her.  But..... I am not good at letting go of control.  This is either going to make me grow or drive me crazy.