I would mention it to her as you stated in your last post. Definitely don't just let it go. If nothing else, what she did is inconsiderate.
I too was thinking it sounds like classic MLC behavior. Given what you've posted in the past about her and about your R, I would pay very close attention to what she's doing. NOP did say a couple of months ago that she was a prime candidate for an A. Make sure she's getting plenty of attention from you, and not just from the young alpha males at the gym.
And you know, it just occurred to me that she could be "testing" you, perhaps unconsciously even, to see if you're paying attention. I remember your jealousy thread a couple of months ago. Definitely talk to her about it.
