I find we're having to have these 'tact' discussions quite frequently at the moment, she seems to be unable to stop herself declaring that people are 'old' or 'fat' or 'short' or whatever... eep!
Same! DD2 points at people in the street and yells "That's FAT!" The other day she dropped something and went "Oh For crying out loud's sake!"

At least I know my attempts to not swear are working