Honestly, I think the best way to reach her is to talk to her about the Zika virus. Ask her if the people in South America who eat compared to us very unprocessed foods, lots of veggies and fruits, yet this virus is spreading alarmingly.
Ask her if in Canada it started to spread if she would decline a vaccine to protect her and an unborn child based on the advice of people who don't agree with medical science and almost 100 years of medical research and experience.
Then ask her if mothers in these hard it areas should decline vaccinations if they become available and rely on clean eating to protect them, which many of them do...
Then show her this picture and ask her how you would feel if you did all the healthy eating you could, and this still happened how you would feel.. Because that is what parents feel when their kids die, suffer horrible side effects from being infected by preventable diseases that vaccinations protect us from.