She has painful canker sores caused by menopause. why the pain become unbearable/intolerable, when she is around fragrances/scents?

Neurological?: Strong fragrances and scents are known triggers for nausea and headaches. It is plausible that they are triggering neurological events manifested as pain. Avoid these triggers and try supplementing the body with an anti-inflammatory diet rich in natural antioxidants.

Osmophobia: is sensitivity or aversion to smells. The condition is due to increased activation of specific scent and pain receptors in the brain.