Diet Coke Death

Two girls ate dinner together at a restrant. Lilly and Jane both ordered diet coke. Lilly drank 3 in the time it took Jane to drink one. Jane died while Lilly survived. Both of the drinks were poisened. How did Lilly survive?

Answer: The poison was in the ice. Source: https://riddles.com/4920

Two girls ate dinner together at a restrant. Lilly and Jane both ordered diet coke. Lilly drank 3 in the time it took Jane to drink one. Jane died while Lilly survived. Both of the drinks were poisened. How did Lilly survive? — Diet Coke Death by Llama Walsh Riddle