You Mell

So Katie has learned that when she smells something funky to tell whoever is around that they smell - usualy it ends up being - you mell mommy! Nice! The conversation goes something like this:

K:- You Mell mommy
Me: I dont smell Katie
K: Yes you do! You farted!
M: Katie, I did not! Andthats not a nice thing to say to someone!
K: ok - I mell something stinky mommy!

Ugh!!!! How do you teach a 3 yr old not to tell someone they smell or they smell somthing stinky?????