It can be awkward as a woman to be comfortable with attention like that. But if she saw you appreciated her beauty instead of feeling creeped out & insecure hopefully she was smiling later. I used to be very shy because I didn't like my breasts & guys (& girls) body shaming (about anyone) really builds the idea that people will be unkind if they see me. In my 40s now with kids; most of my acquaintances have seen me breastfeed. Guys are usually appreciative. A kind response builds confidence.