So had a great session with IC yesterday. He listened intently on my planned conversation, played devil's advocate quite a bit and tried to figure out ways to derail me and help me out.
He agrees that the conversation is definitely a good idea for myself and for our R.
He tweaked it a bit and suggested that I don't have the conversation right off the bat when I walk in the door and see W. Instead, he suggested that I go about my usual "coming home" routine and then begin going about helping W like she'd asked. He suggests that pretty much as soon as I begin helping her, I throw the ball in her court by asking "So What's going on with all this?"
He suggested that I see if she's in a place that she wants to open up about where she is, which we both doubt will happen. Then, feel free to show a little "edge", a little (read: LITTLE) bit of anger over the situation and her unwillingness to clue her H in on what's going on.
This will almost certainly lead to an easy opening to have the conversation. IF somehow it goes in a different direction, I'll simply listen to what she has to say and have the conversation the next morning before her room mate gets down to finish off the packing.
I definitely like this approach, as it puts the onus on her to explain herself and her actions and leaves a natural path to the conversation without it feeling forced or confrontational.
I'd go into more details, but I'm short on time this afternoon.