The reflector was so low, none of the light got to her eyes.
Low light like that is routinely used to make a person look sinister, not pretty.
Have you read about the basic lighting techniques - like broad lighting, short lighting, etc?
By the way, uneven shadows make a more interesting portrait.
With the sky that bright in the background, a reflector cannot provide enough light to make both the subject and the background the same exposure. You can use the in-camera meter to measure the light ratio. Spot meter the brightest part of the sky, then spot meter the highlights on the subjects face. the difference will tell you how much supplimental light you need to balance the 2.
For using flash, the GN number and the subject distance can then be used to do the simple in-the-head math calculation that tells you what aperture to use for the strobed light.
With some experience and thought, the in-the-head math becomes second nature.