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try Niney Acres in Gladstone. Here is a link:
If you can, tell her to take any class by Kathleen Sanderson. She is my favorite and a GREAT teacher!!! Classic Thyme as mentioned is wonderful, too! (I took a class by Kathleen there!)
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As you noted, the Kings Supermarket in Short Hills has cooking classes.
Not sure whether too far from S.Orange for your sister, but I've given gift certs to Classic Thyme in Westfield to several people and they all came back very positive about the clas(es) they took there.
