Help! My child has learnt to swear!

Now I am forever trying to encourage my daughter to learn new words, we regularly sit down and I get her to repeat words – good words. The amount of times I have to repeat words like ‘butterfly’ only to be answered with ‘flutterfly’ or ‘cuddles’ when I ask her to say ‘puddles’ even Peppa Pig hasn’t helped me out with that one! However if I am in  a different room and I quietly say a naughty word in she comes running and shouting her new found word, not only has she managed to hear it but it is the most perfectly clear pronunciation ever!