I think the quote from Ch. 42 is Lizzy’s point of view about her father and it has been her opinion for some time: “Elizabeth, however, had never been blind to the impropriety of her father's behaviour as a husband” (42) and the prescient moment thought is:

But she had never felt so strongly as now the disadvantages which must attend the children of so unsuitable a marriage, nor ever been so fully aware of the evils arising from so ill-judged a direction of talents; talents which, rightly used, might at least have preserved the respectability of his daughters, even if incapable of enlarging the mind of his wife.” (42)