of advice, which you probably already know. Find out what she REALLY thinks about her height. My ex was so sensitive that we actually left a company (mine) Christmas party when someone made an innocent remark about her height. I learned to be very cautious when discussing height.
That's also one reason why I ended up with custody of my two daughters. Ex blamed herself (it's genetic - passed from mother) for their lack their height. After divorce I worked with my daughters to give them a positive self esteem and taught them how to counter the crude and crass height remarks made toward them at school.
I know it's early in the "relationship", but just wanted to tell you my experiences. Good luck.