What is the nature of Rosamond’s attachment to Lydgate?

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Not that this inward amazement of Dorothea's was anything very exceptional: many souls in their young nudity are tumbled out among incongruities and left to "find their feet" among them, while their elders go about their business. Nor can I suppose that when Mrs. Casaubon is discovered in a fit of weeping six weeks after her wedding, the situation will be regarded as tragic.