Perhaps I should have phrased the "any suggestions" differently.

I DON'T harp on her. I haven't mentioned low-carb to her AT ALL. She mentions it to ME.

I'm aware that she's an adult. She's free to make her own choices. My dh, my FIL, my SIL, even my 10 yr old BIL, all of us are worried. None of us say anything to her about it; we just lead by example.

I just need encouragement from people who have been in my situation, not to tell me to leave her alone.

Sorry. Off my soapbox now.