I think it's extremely likely that the majority of people in India and surrounding countries - so, hundreds of millions of people - far exceeds the WHO recommendation every day, and frequently eat as much as this woman did, in foods that also contain black pepper. I googled to make sure, and the top five or so links all said that Indians eat an average of 2-2.5g of turmeric per day.
So perhaps the issue was something else? For example:
- contamination
- taking it on an empty stomach rather than with food
- genetics
- liver damage from something else entirely