Jeff managed to walk away from the milking barn, even though it was a chore. Her body was just all wrong at the moment and it was a struggle to get anywhere. Not that she had really anywhere to go.
She found a spot with some long grass and lowered herself down on all fours to grab some in her mouth. She pulled at it with teeth that were still far too human to make good work of it, but managed to chew and swallow it eventually. She started to stand up when she realized that her hands where gone. She had been so distracted by her chewing and eating that she hadn't even noticed.
Experimentally, she took a step forward and all fours. It felt wrong and right at the same time. She moved naturally now, more or less, but she could feel that her body had bulked up tremendously. She walked toward a large water trough nearby and looked into her reflection. She could see her mostly human face still there, but her ears were now the size and shape of the cows that surrounded her. She took a drink and then looked over her body. She was about the size of a young cow, though she wasn't sure if she'd get more bulk from her transformation or from the food she was eating.
That though came with an instictual urge and an unfamilar muscle movement, and suddenly her mouth was full of wet, half chewed grass. She almost spit it out, but found herself just chewing it. It was her cud, and cows would chew and rechew their food for most of the day.
She looked into the still waters as she chewed and watched her face expand and extend, and grow. She finally felt confortable swallowing the cud about the same time that her head was changed.
She turned from the water and went back to the pasture, now fully formed into a milk cow.