Lierre Keith was never vegan and she was carb-phobic.
What she stated in an interview:
“I never cheated on beef, but I certainly binged on eggs and dairy every chance I got.”
I'm sure if her diet was analysed it would show she was eating way too much fat, not getting enough carbs, being a junkfood vegan, not eating diverse enough, and was probably calorie-restricting, but since Lierre doesn't give an exact breakdown of what she ate, we'll never know so it's all meaningless until we know all the facts. But one fact we know is she wasn't vegan.