Hi Gemini,
I totally understand the complexity of your situation (Im a Gemini too by the way).
I'm looking at my synastry chart with my ex, and she has her moon, vertex, and lilith in my 12th. And although I found her attractive at first, she was really last on my list of potentials when I was dating. In the end, she kind of snuck up on me, as I really didnt realize the depth of her attraction to me.
My Venus is in 12th, that's where her moon and vertex conjuncted. Your Sun conjuncts her Mars, so there's definitely a physical attraction. I think you're looking for more of an emotional attraction, so you would look at the Moon for that.
Like you said from the beginning, she has that cool, detached, and unemotional Aquarius moon, and that's her "default" way of being, of automatically detaching if things feel like they're getting too "mushy" and messy. That's just her survival instinct. You'd want to see what her Progressed Moon is to get a better understanding of her emotionally at the moment.
But with her Moon trine Pluto in Libra, controlling and manipulating things in relationships comes naturally to her, and it can border on abuse, so be careful here..