If your sister is having problems, I think she should be able to approach the teacher during office hours to ask for help.
Otherwise, she might check out the local library for books on stitches.
I have a sewing machine (which I love) but it pretty much does straight stitching so I can't really help you in that aspect. Some expensive machines can do all kinds of different stitches. It really depends on which machine you are talking about.
Good luck!
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Kim
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