I mean from just a small glimpse of her profile I'd just say

"cute, outdoorsy and a bit of a wild side"

let us know how it goes, best wishes

"Why do u want to know, is it so u can hide it better??"

"That's top secret, the only way I'll talk is if u seduce me. I'll say anything amidst the throes of passion"

"Its the hat, dead giveaway"

Just say something ridiculous and/or refuse to tell. This is a great opportunity to be playful!