那是她自己的主意。

It was her own idea.

《牛津词典》

然而，在一年快要结束时，她突然提议让高维内尔再次前来拜访，而这次完全是她自己的主意。她的丈夫虽然惊讶，但是却非常高兴听到这个建议。

However, before the year ended, she proposed, wholly from herself, to have Gouvernail visit them again. Her husband was surprised and delighted with the suggestion coming from her.

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她把这个主意妄称是她自己的。

She passed the idea off as her own.

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