I am in the middle of this right now, too. Why don't you try slowly bringing the bedtime earlier, say 7:30 tonight, and see what happens. That is 5 hours and you said she is capable of handling 5 hours? I've also read that the EW can occur, but over several days-to weeks it works itself out (and you can bring the bedtime back to the normal time). I guess they just have to get used to the longer A time. I am new to this though!