E.S.
I beleive the reason for your being so full at night is because she feeds until you are dry and your supply believes it should replinished for a night time feeding when you aren't having one. It's not bad at all for her to sleep through the night. IT's actually great that she does. I know many other mother wish they had the same thing. However it's going to have to be some way you will need to eliminate that mid-night pumping so that your milk supply will respond to not having a feeding until the next morning. Don't worry it will all fix itself. Don't pump unless your are uncomfortable, and even then only express enough to be confortable. Your breast will respond accordingly. Hope this helps