OK, I'll bite.

Positive responses are always welcome to our ears. If she states she is fat, try not to tell her she's not. That feels like you're discounting her statement (it may very well be how she feels at the moment). 'You're not fat' can feel like 'you don't know what you're talking about'. Instead, express your opinion - 'I think you look great'. Everyone's entitled to their opinion, right?

'Is there anything I can do to help?' is also a good response. She's complaining about her weight, can you help by helping her eat better at home? Can you, as a family, take a walk in the evening?

Even though we may seem to blow off a positive response, we still hear it. And it makes a difference, believe me.

It's all good!

AO