If they ain’t rated against UV, they are helping a tiny bit but not that much. Also if you’re near the water, you get burnt from water reflections. She gotta invest in some sunscreen, ain’t no two ways about it! On the plus you get to help her apply it :)
Well, she might just be like some of us and gets red whenever the sun shines upon her? But yeah, it can’t hurt to have stronger stuff :)