There is a very simple reasons why models do not get a copy of every photo that is taken at her modeling photo shoot.
It's all about professionalism. Just like fashion models, fashion photographers are very concerned about their reputation, and they do not want bad photos to be circulated out of their control. Indiscriminately handing out bad photos along with the good reflects poorly on the photographer's professionalism. Most model don't want ugly, embarrassing photographs of them circulating. Likewise, most serious photographers don't want any unfinished, rejected photos in circulation.
There are some rare photographers who give the model a copy of every photo. One of my friends in Seattle gives models a disk with raw, un-retouched copies of every single photo. He's very casual about it, and told me that he felt models could learn by seeing the bad photos of them.
But that's an unusual policy. Most photographers are very protective about only showing the finished photos that are of satisfactory quality. They're simply worried about things that can tarnish their reputation.
Just remember this: Heidi Klum, Tyra Banks and Gisele Bündchen do not get copies of every photo taken at their shoots. Don't expect to get something they don't.