What you don’t see is how much pain and heartache there is behind her eye roll, she’s not shrugging you off, she’s fighting back the tears that come with your criticism. You genuinely think she’d be better off doing the exact opposite of everything she is doing, and that’s tearing her apart.
I hope you realize soon that every time you ask her what she ate, you’re making her hate food.
It’s these little comments that add together in her mind, associating food with stress. She’ll make the subconscious decision to stop snacking and only eat salads if that’s what it takes to gain your approval.
And little by little, those salads will become smaller and sooner or later, she won’t eat anything at all. She’ll become a shadow of the person she used to be, spiraling out because you stole every sense of control from her.