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"I have said no such thing. I am only resolved to act in that manner, which will, in my own opinion, constitute my happiness, without reference to you, or to any person so wholly unconnected with me. […] Neither duty, nor honour, nor gratitude," replied Elizabeth, "have any possible claim on me, in the present instance. No principle of either would be violated by my marriage with Mr. Darcy. And with regard to the resentment of his family, or the indignation of the world, if the former were excited by his marrying me, it would not give me one moment's concern—and the world in general would have too much sense to join in the scorn." (56.64-69)
Elizabeth doesn't use the word "pride" here, but that's exactly what she's talking about: acting in a way that's consistent with her own (high) opinion of herself. And that's got to be a good feeling.