What I personally would do:

If she knows sit, I'd have her sit or lay down and reward her with her dinner. I'd just put it down and walk away and let her eat at that point.

If I wanted to reinforce for awhile that good things come from my hand, I might sometimes feed her a few kernels first and then set the bowl down, or feed her part of her dinner and then add a bit more as she eats or when she finishes. This would not be a permanent thing I'd do forever. It would just be something for awhile to teach her that I am the food bearer and bringer of good things.

I'd teach her "leave it," and once she has a grasp on it practice "leave it" before dinner and then rewarding with dinner.

I also highly recommend clicker training, it's a wonderful and positive way of making training fun, and a way of "marking" the behaviors you want her to know are good.

http://www.clickertraining.com/ Is a good place to learn more.

I bet it'll turn out just fine. Don't get too distressed.