[3][4] She is married to Michael O'Neill, the founder of the now-defunct Informed Medical Options Party, an anti-vaccination and anti-fluoride political group.

[1][3][4] An investigation found that she provided dangerous advice to vulnerable patients, such as telling those with cancer to forego prescribed chemotherapy for bicarbonate of soda, and to give infants unpasteurised goat's milk.

[5] According to O'Neill's website, she provided detox services claiming to aid recovery from heart disease, diabetes, hormonal imbalance, chronic fatigue, candida/fungus, drug addiction, cancer, heartburn, and obesity.

[5][9] In late 2019, it was revealed that a Cook Islands man with stage four cancer had died after following O'Neill's advice, having declined medical intervention and attempting to treat his disease with bicarbonate soda, lemon juice, and boiled water.

[3] In one of her YouTube videos, she stated that "children can be naturally vaccinated against tetanus by drinking plenty of water, going to bed early, not eating junk food and running around the hills".

[5][3] The Royal Australian and New Zealand College of Obstetricians and Gynaecologists' statistics show that 14% of newborns who contract early-onset Strep B die, and that antibiotics can reduce this risk dramatically.

[8] The Commission found that some of her recommendations were based on ideas espoused by Tullio Simoncini, a disgraced Italian former oncologist and alternative medicine advocate incarcerated for fraud and manslaughter following the death of one of his patients.

While O'Neill has claimed to have received diplomas in naturopathy, nutrition, and dietetics from two now defunct organisations, the HCCC found that she did not have any health-related qualifications.

[8] Accompanying the petition, O'Neill comments that, “It looks a bit dark now, but the Great God of the Universe will not let His wonderful health truth to be eliminated, regardless of how men and women may try.”[4] She has also claimed to the press that she is a victim of a Nazi-style propaganda campaign.

[4][6] Although the HCCC ruling prevented her from providing or promoting her services, O'Neill continued to advertise through her website and that of the Misty Mountain Health Retreat.

Herman raised concerns regarding O'Neill's suitability to be delivering health services, including the legal requirement of an annual practising certificate amongst other documentation.