I think being honest is your best bet. I think you can tell her you had a good time without sounding like you are gloating. I think you did that in your messages.

It has to be hard coming home to an empty house. As you know, I am facing that in about 3 weeks. Any advice on how to not let that totally just beat you down?

Also it is good that you can still message her and be cordial. I am afraid that I am going to have trouble with that. I think that when she leaves I will not want to speak to or message her. Maybe that feeling will change.

M 37 W 36
T22
M14
D8
D4
8/2012 distanced
BD 11/2012 (likely wants D. Feelings have changed.)
W move out date: June 8th.