Won't stop eating!

I will try and get her to stop eating for a few minutes to photograph her head. She is just so hungry she won't stop eating grass. I put her with a small herd of horses. There are 8 others on 60 acres. I put her in the pasture and she put her head down and started eating. the other horses tried to chase her, the geldings bowed up at her, the mares swirled around her but Katrina kept eating. A week later, I am trying to take a picture and Kat is still eating!