Not actually misinformation. If you want to use a bad-sounding word to describe her beliefs, I'd suggest "malinformation" is a bit closer to the mark, as it means factually true material which is censored because it interferes with the agenda of the people in charge.Her views on masks and vaccinations.
Masks do not work because they cannot work. Viruses are much smaller than the gaps in the mask material. Prior to 2020 we had many high-quality studies on mask effectiveness and every one came to the same conclusion: that masking has no statistically significant effect on the spread of influenza-like illnesses.