She was weary of being swept passively along a current of pleasure and business in which she had no share; weary of seeing other people pursue amusement and squander money, while she felt herself of no more account among them than an expensive toy in the hands of a spoiled child.
There are no more uses of "squander" in the book.
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She squandered the money she inherited from her grandmother.
She squandered the opportunity to get a good education.