A lot of times, those we love going through this feel like they are taking away from us. Everyone is different and I cannot speak from her point of view. But, I'm pretty sure she wouldn't want to feel as if you feel sorry for her. If she feels that from you, she will pull away because it would make her feel weak. (Just an opinion) Look at her as you have when you first met her. "Hi honey - how was your day?"....."Mine sucked...you wouldn't believe what happened...or whatever. Sometimes nothing said is best. You'll feel it (if you are paying attention). Try not to try so hard to get into her head, because you'll never truly understand. Follow her lead when it comes to how she is feeling. It's not easy because YOU can't fix it.
Check in here once in awhile. Sometimes responses don't come when you need them, but just getting your feelings out helps. Hugs