Elizabeth also struggles to maintain her happiness:

When to these recollections was added the developement of Wickham's character, it may be easily believed that the happy spirits which had seldom been depressed before, were now so much affected as to make it almost impossible for her to appear tolerably cheerful. (chpt 37).

This contrasts dramatically with Mrs Bennet's, Kitty's and Lydia's behaviour, who all let whatever they are feeling just hang out:
Well, my comfort is, I am sure Jane will die of a broken heart; and then he will be sorry for what he has done." (chpt 40)
"I am sure I shall break mine," said Lydia. (chpt 41)
the luckless Kitty continued in the parlour repining at her fate in terms as unreasonable as her accent was peevish. (chpt 40).