Make a list of things you'd like for her/ways you'd like to treat her and "notes" for your mirror, etc. for yourself to remind you? I'm reminded of the Adam Sandler/Drew Barrymore movie, "50 First Dates"
http://www.sonypictures.com/homevide...tes/index.html where she has a brain injury so can't remember anything after she goes to sleep.
Tell your girlfriend what you've told us and, as biplol suggests, keep that communication thing working. Good luck!