She's a pretty kid! Should she pursue modeling? If she has no interest, then no. My daughter has modeled for me over the years in the studio and on location, always had fun with it, but never had the interest to pursue it beyond our work. The models with whom I've worked have a real desire for it and also have a mindset for it. They also have some real stories. It isn't just posing, moving, emoting, et al. It's working with strangers, typically guys, and having the ability to stay safe either by avoiding a bad situation or leaving a situation before it turns bad. At 15, she'd need a parent or guardian for signing releases, and ideally for being present during the shoot. At 18, she's on her own.
That said, I've worked with many capable and intelligent women for whom modeling is a hobby. One model actually had an editorial in U.S. News and World Report (yes, the national magazine) on US participation in the international market for military drones. Another model is successful in international business. Both of these women are in their mid 20s. Perhaps your young lady friend may decide to model some day. With her look, especially in that second photo, she could. It need not be the sole focus of her professional life however. With a bit of experience and some street smarts, it could be a hobby.