"I may be fat, but I beat my eating disorder"

[Losty]

I think she looks fine in both pictures. Not having an eating disorder is way more important than not being fat, but she's not fat. She doesn't look unhealthily thin in the first picture. She doesn't look unhealthily fat in the second picture. Both pictures are fine. Both reflect who she wants to be at the time she was photographed. I think it's stupid to celebrate being fat. It's also stupid to celebrate being skinny. Eat healthy and go to regular well checks. If your doctor says you're healthy then celebrate regardless of how you look or what people think of your body. If your doctor says you're unhealthy, find out what you can do to change it. For your own health not to fit in. It's stupid to let girls think they have to be really skinny to be pretty. That's where this whole thing started. Then they took it too far. It's stupid to let girls think being fat isn't unhealthy.

You teach your kids to be healthy and eat right and take care of their bodies. This is a health thing. You talk about it at the dinner table, in the garden, or on a family hike. You talk about how you treat you body and how it affects your health. Don't mention pretty in these talks. It's about health and prettiness is irrelevant to health.

Then separately you teach your kids to be confident in their looks. You let them know that it's okay to not be exactly the same as everyone else and it's our differences that make us beautiful (or handsome). You talk about hygiene, cosmetics, and clothing styles. You can mention words like pretty and beautiful here. You can tell them that they shouldn't feel pressure to go through all this work to make people accept them, but if they just like it or it makes them feel good to dress up then they can.

I think it's really important to keep the two issues separate and completely avoid the whole issue of fat vs skinny. Healthy vs beautiful.
Of course your daughter is beautiful even if she's fat, but she's not healthy and so you talk about the health issues with her at dinner and during excercise. You can still build her up in front of the mirror and tell her she's beautiful. But don't tell her she's healthy if she's not.