Don't worry -what you are doing IS working, you just have to keep it up for a little longer and she will get it. You have got three days of the good stuff, a hiccup here and there is nothing because you may get 4 days running, then a hiccup, then 10 days etc etc.

Sometimes you have to change your own approach about it to save your own sanity. ie - WOO HOO 3 days! OR, my fav when I am poking my eyeballs back in, is to remember the times (in the OLDEN days) when I used to stumble home from the pub at a ridiculous hour and get up for work the next day on 4 hours sleep......I did it then, I can do it AGAIN!
Don't count the hours you haven't slept, but the ones you have....

This too shall pass, it WILL.

Just keep up the same routine, she will welcome it one day.