She’s just looking for ways to vilify you. A lot of these waywards project their selfishness on to you. They also look for reactions. I think when they pick fights like that, it’s best to remain polite and not acknowledge what they say. Only acknowledge the logistic stuff or phony fake polite stuff. . (Like don’t explain yourself about the weight loss to her. That gives her power because you are justifying). Non acknowledgment drives them crazy and keeps yourself protected.