It's funny!

Have you ever noticed the funny sign side of things? My fiance is blessed with the voice of a songbird. She sings great and loves to do it. However, there is just one problem. Last week when I was listening to the bird I noticed she stays in key but has a half second delay! The words on the song come out and then a half second later here comes her voice! I thought I should start remixing the songs she loves to sing and slow them down but what if she is still a half second off?! If I did that the songs would be so slow you could count the syllables.