The issue is her own insecurity that she may not be good enough for you, causing her to hold back, even if she's hot and has no rational reason to. You said something along these lines a few weeks back, about what an actual accusation of arrogance really means about her, and how to spin it. I've nicked that and used it to great effect on one occasion in particular. I wouldn't make "nervous nelly" your whole frame, but a bit of seasoning may ground things a bit.

PS