Hey there, I agree, she is obviously using that language as it gets and A1 reaction! This equals attention! Attention is great! With my DD - who manages to pick up every nasty word she hears listening to her dad use the phone, I pull her up and say - "hey, that's a horrible thing to say, where did you hear that!"she wlll say, "Daddy said it on the phone!" I tell her that if I hear her say it again she will get her bottom smacked, then I tell her that if she hears her Dad say it, she can smack his bottom too! VERY HARD! I also tell my husband that if he wishes to speak with his mates using bad language then he can take it well away from us- and expect a hard whack from DD if she hears him swear! It is inevitable that they will hear ( and use quite in context) many swear words once they start school. It is up to you to teach them the difference and have consequences if you hear them use it! I know that I tell my DD that they are yucky words and ask her what else she could say.Lead by example- you don't want your child to use cuss words, don't use them yourself! I know my Mum used to use chilli sauce on our tounges if she heard us swear...however, she at times had a fairly colouful vocabulary, so when I pointed that out prior to a dose of sauce....I GOT A DOUBLE DOSE!!!!

She knows saying those words get attention.  Since you have explained to her those words are unacceptable just completety ignore her when she says something bad. 

The only way is to keep telling her they are bad words and keep her away from kids and adults who do.