Suggestions for the mom of a chatterbox

Lately Grace has been talking up a storm, commenting on EVERYTHING (I have no idea where she gets this!) For the most part this is great, however I have started to run into the problem of how to react when she says things that she probably shouldn't. Luckily she hasn't heard any swearing to repeat yet (I am sure that ones coming!) but she does have some other funny phrases that could be taken the wrong way. Her favorite lately has been "Oh my gosh!" usually, she says something like "Oh my goooossh, mama, you gotta see this!) The problem is, because of her lack of annunciation, it sounds like my two year old is walking around saying Oh my god every few minutes. The other thing she is doing is when we are in public she has been calling me Linds when she can't get my attention. She'll say "Mama, mama,...Lindsay...LINDS!!!" Which, again, is hilarious, but I don't want to encourage it. Obviously I should try not to laugh, but do you guys think the best thing to do is ignore it so she doesn't get a reaction and lets it go? Or should I try to explain why she shouldn't say some of the things she says? (can't imagine that working!) At a loss...