Unfortunately in my efforts to be a nice guy, I think I am confusing her.
Once again from a woman's perspective - or at least
this woman's perspective - the problem isn't you. She simply can't take a hint. The word "obtuse" comes to mind.
I must have missed it in other posts, but I didn't realize that she is married as well! Dude, that makes this whole situation about a gazillion times worse! At first I smelled a very obvious rat, but now I smell a huge, rotting dinosaur. Cut.her.off.now!!!
I mean really, what married woman would repeatedly send a man other than her husband (a married man at that) kissy faces? I'll tell you - a woman looking for trouble!
And now that I think about it, it's not that she's obtuse and "can't take a hint", no, she's willfully being persistent and *won't* take a hint. She knows you're a nice guy, and my hunch is that she's trying to wear you down.
It's a good thing that other agent was in the office with you because that woman is dangerous. Don't ever allow yourself to be alone with her. If you have to go into the office at odd/late hours, if at all possible take your wife (or a friend) with you.
It's high time you inform your wife. It sounds like your wife is pretty cool, so if YOU don't want to hurt Ms. Obtuse's feelings, your wife may be willing to play the heavy and do it for you. (Hubby and I have done that in other situations.)
I don't know if you're old enough to know the reference, but this definitely qualifies under: "DANGER WILL ROBINSON! DANGER!!!"