No, she isn't 40 yet. Never married.
I know what you are getting at and I'm sure you are at least partially correct.
Like I said, it has been "out there" for awhile now. I could have thrown down numerous times but declined.
There might be a part of her that is being driven by a desire to "nest", but she knows where I stand as far as relationships go, and I don't feel any desperation setting in from her. I think she is smart enough to realize that there will never be anything between us.