What a good friend you are to try to help her!!! Right now she's probably frustrated and so any mention to help her with it only makes her feel more inadequate. Give her some time to simmer down and maybe later try to show her how to do it. I hope this problem doesn't make her decide that quilting is just not her thing. Maybe if you say that we ALL had to start somewhere and with lots of mistakes. I'm sure even the most seasoned quilter still makes mistakes.