I just about gave up on hearing from you...I'm glad that you are here again...
So, the ring is off? I would ask...something along the lines of ...did you lose your wedding rings?
It could be she is testing the waters, not wearing it. Seeing that her mood has changed, she might feel it releases some form of mental weight she has about the marriage...
If you don't mention it...it seems that you are accepting that position...
I'm so glad to hear the descriptions again of Sweden.