What was the final effect of Darcy's letter on Elizabeth?

From the text:

"Her feelings as she read were scarcely to be defined. With amazement did she first understand that he believed any apology to be in his power; and stedfastly was she persuaded that he could have no explanation to give, which a just sense of shame would not conceal. With a strong prejudice against every thing he might say, she began his account of what had happened at Netherfield. She read, with an eagerness which hardly left her power of comprehension, and from impatience of knowing what the next sentence might bring, was incapable of attending to the sense of the one before her eyes."