I don't think you can. Think of it this way. If that is her main problem, you are very fortunate!
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AlpheccaStarsIf she is receptive to improving her speech, have her read this: http://www.wikihow.com/Stop-Saying-the-Word-%22Like%22I just read your post, and I wanted to show how good I thought it was, so I had to click on the word "Like".