She could have done it the way another celebrity chef did it years ago - Paul Prudhomme. His cooking style was very unhealthy until he came out and said he now knew better, and started promoting lighter versions of his recipes. Graham Kerr is another one - way back in his heyday, he was known for loading up dishes with unhealthy ingredients, so when he got smarter, so did his cooking shows where he actively promoted healthier choices.
Paula could have done something similar - been open and honest about her diagnosis a lot sooner, and helping her followers refine their diets and get more active. Of course, big pharma would rather than not happen, and for many, it felt like Paula went along with that so she could continue selling her old style cooking (shows, restaurants, books, magazines) rather than taking the opportunity to really do something about it.