Keep your own insecurities out of it: Even if you don't make disparaging remarks directed at your daughter's body, she will pick up on your own insecurities the more you voice them. Stay away from complimenting her body by putting yourself down or saying things like "I wish I had a figure like yours." She will pick up on what you don't like and start judging herself by those standards.
Make it a family affair: Focus on health and strength versus weight and size. When nutrition is a family priority, your child won't feel singled out or have a negative association between food and body image.
Make it age appropriate: Although your little one might be in a rush to grow up, have an open conversation about what trends and styles might be too mature for her age, even if they come in her size. Teach her how to appreciate her body exactly the way it is now instead of being in a rush to change.
Don't point out other women negatively: Remember, the standards you set for other women, even adults and celebrities, will be the same standards that your little girl starts to compare herself to.