Just a question but it seems to me that your W was giving you the green flag for sex, but in her own way trying to tell you how to approach her in a manner that arouses her....why didn't you try it?
Instead it appears to me that you did the same thing you usually do...test the waters timidly (and she repositioned and she always does with that)....which isn't the "confident" approach she mentioned.
I don't feel that you have to be super alpha male to approach her in a confident manner. What (out of curiosity) do you think the outcome might have been if you just hauled her over your shoulder (without a word)...or grabbed her by the hand took her to your bedroom and plopped her butt down on the bed and started undressing? No words necessary, and the intent is pretty clear....she wouldn't mistake it.