Sad as it is, the D is right around the corner and she is likely feeling the pinch of time running out and all the emotion that goes with that is starting to get to her.
It does seem as though you pulling back a little is drawing her near. So you should probably keep that going as much as possible. Be careful not to attach any emotion to this "appreciation letter". Accept it graciously and then step back. Keep your detachment in place and watch for additional signs.
Hang in there, Crimson!
Me51 W53 S17 S14 M22 T25 Bomb-9/11; A-11/11; I move out 11/11
It's easy to find our bottom, it is our top that requires cultivation.
Every rough spot adds to our emotional constitution. -Barney Fife