I'm sure someone will be able to post some tips who have experienced this but I just wanted to offer my support. I know you have to be frustrated. I also don't think you will find an easy golden bullet. What you described about Sunday school homework and having to sit down with her and redirect her attention back is more in line with what you will probably be doing for a while. Habits are not formed over night. They are habits because we are consistent in our approach. I suspect you will need to devote a lot of one on one time with her at home during homework time and reinforce the components of how to tackle the assignment. Doing this with her will establish habits and skills that she will find herself doing in the class.