I'm happy now, she is being fed well. I finally got up early enough to catch the Hispanic man who feeds every morning and had a talk with him, and he agreed that my 16.1 hand Thoroughbred should have more hay than the 13.2 hand Arabian pony in the next stall. (Although he was throwing the same size flake at both of them).
So, good news, I can stop going out every evening and supplementing her with 6 lbs of alfalfa cubes, and cut my gas costs and my feed costs, and jeez, I might just be able to afford her! :)