I suggest you go to each sewing machines web site and look at the different sergers(overlockers) to see what is available. Then make a date for a luncheon, an afternoon out, etc and take your Mom to a few shops and allow her to try out the machines in your price range, which can vary greatly, depending on different features. Personally, I have a Pfaff 4872, 5 threads and cover stitch, that is about 6 years old, which I enjoy using. Other people who I know have others and enjoy theirs as much as I do mine. Sewing machines, including sergers, are very personal, like the automobile, so your Mom ultimately needs to choose the one she likes and feels comfortable using.
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These are some of the web sites, which I believe are all correct. Emily .