I understand what you said about counter acting the metering. However, I do not see an "AEL" button on my camera. I will have to get the manual out. The next shoot with her is another desert shoot, about the same conditions so I am going to research and read some more on shooting in Manual and take some practice shots so that I know what I am doing before I do a shoot with her again. I am a few weeks away from being able to purchase a light meter but, I downloaded a Light Meter Ap to my iPhone. Admittedly, I have not attempted to use that in sync with shooting yet.
What camera are you shooting with? on a Canon DSLR, it's the * button, up where your right thumb can get it. Most Nikon DSLR have a button clearly labeled AEL.
You don't really need to buy a hand held light meter. Sure, it would help, but it's certainly not necessary. If you can grasp the principle of needing add exposure when metering something bright, and subtracting exposure when metering something dark...that will mostly solve your exposure issues. Knowing how much to add or subtract will come with experience.
As for viewing the image on your LCD, yes it can be hard to see outdoors....that is one reason why I teach my students not to trust the image they see on the LCD screen. Besides being hard to see, it's not fully calibrated. Learn to view and use your camera's histogram display. That will be a much better tool for evaluating your exposure.