The math works out to 5.3k calories? Like, I'll pop a spoonful of peanut butter as a snack every now and then but holy fuck that's a lot of peanut butter.

One standard jar is 1 pound so she is claiming 1-2 jars per week. That is not unreasonable and I find it highly unlikely it was what destroyed her health. I eat about 1 jar per week.