Primarily English has rules about where not to put a comma. Many people will put a comma before "and" in an enumeration, but it is not mandatory. It is, however, mandatory to use one in an enumeration where there is no "and" or "or", as in the list on the magazine front page; the woman in question finds inspiration in a) cooking, b) her family and c) her dog, not in cooking (her family and her dog), which is very much a one-time inspiration.