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Say you see her and she hugs i'd go " Are you touching my arse?!?!?!" things like that
And throw in C & F comments, accuse her off trying to seduce you (Someone else gave out this advice, I'm taking no credit for any, i'm just passing it on)
Also start kino, start touching her (Not in That way! Yet

)
(Yes in That way!)
Have no fear my friend. There's the key. The best naturals I know will spank ANY girls ass. No matter how they know her, no matter if she's been telling them off for the last ten minutes. You need to touch touch touch and never apologize for it. This is easier said than done, but you need to represent physicality as your natural state. You could talk about the weather for an entire date, and as long as you touch her enough, you're in.
Three other points. Yes, like Eddie said, it's helpful to blame her for your sexuality. More along the lines of "You're really sexy, you're making it hard to keep my eyes on the road" (if driving. "I can't focus on my food" if eating, etc).
This leads into my next point. You can't hide the fact that you like her! In fact you should tell her AND SHOW HER. This means indicating unequivocally that you're sexually attracted with both words and deed. "Wow, I didn't feel this attracted to you back in school" while touching her knee under the table. I doubt that you'll be able to fully do this, but at least you'll know what to work on.
Lastly, girls need to be challenged. If you're complimenting her all the time, there's no challenge. There is naturally a push/pull in any flirty conversation. When you sense her pull away from you, pull away yourself. "I'm not sure if you could handle me, I might be too much for you."