There are, as most likely know, specific numerical criteria for obesity. If you are at or above a specific BMI (body mass index) you are obese. If she falls into an overweight or obese BMI category I don’t know how she can successfully sue someone for making an accurate remark. I don’t support fat shaming people, but she is the one filing a suit, so she’s putting herself out there for more scrutiny.
The BMI is worthless without knowing more attributes of the person. Thin people can be unhealthy, and fat people who are working out can be in better shape than they appear.
You don’t need BMI to know she is fat. You just need two working eyes.
It’s the old celebrity thing “ all publicity is good publicity”.