I question whether placing the hair in Zone III is appropriate here.

And I wonder whether the entire image is just displayed too dark. Try lightening it a bit, in order to get the face and dress where you want it.

The highlights should be blown out slightly in a back-lighted image like this.

And it seems to me that the face and the dress should be your target when you meter.

You can then decide for yourself what other parts of the scene (with all its inherently large subject brightness range) need to be protected, even if other parts may have to be sacrificed.