Translation:She will travel alone this time.
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It means one person, taken by itself, and one person or alone depending on context, e.g. 餐馆里只有一个人 (one person) and 他独自一个人在餐馆里用餐 (alone). When it means "alone" there needs to be, or it sounds better with, either 自己 or 独自 with it, so that it's role is more to emphasize how "alone" that person/animal is.