The light is bang on Rembrandt lighting, which is a good way to start. You put the sun in a good place.
The problem here is that this "key light" (the sun, and in fact your only light) was a bit harsh, so you wound up with a long range of values from the shadows to the highlights. Since you got the shadowed side of her face nicely lit, the sunlit side of her face is too bright.
The easy solution is to bounce some light into the shadows. Set up something, anything, a guy in a white shirt, a light colored lawn chair, a light colored car out of frame to the left, on her shadowed side. Imagine it's a mirror, try to reflect some light onto her face and body from the front and side. This will fill in the shadows so they're not so dark. Then you can expose the WHOLE FRAME less, without the shadows becoming unpleasantly dark, and this will reduce the excess brightness on the sunlit side of her face.
If you happened to have a day with thin cloud, you might be better off, since this would diffuse the sun a little, making the light less harsh but maintaining some directionality to it (a fully cloudy day loses all the shadows, and everything looks flat and dull).
Remember where the sun was for this one, though, you had it in a good place. You had is in the place Rembrandt put it, so don't let some guy on the internet tell you it was in the wrong spot