Aaww, c’mon man. Maybe she thought the girls could use a little non “Me Tarzan, You Jane, We FUCK?!” tpe of pats on the back. Sure, those are nice but it’s always nice to get a sincere, unsolicited, un-ulteriorly-motivated (yes, I just made that word up) compliment. Or maybe she’s gay? 
Not that there’s anything wrong with that… Either way, I thought it was nice of her. And she is in incredible shape.